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Old 01-09-2009, 05:08 PM   #1
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Default oil pressure and water temp sender

can any one post some picks of where the oil pressure and water temp senders on a 5.3 are, i cant figure which one is which also has anybody hooked them up to a dakota digital dash? thanks
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Old 01-09-2009, 05:52 PM   #2
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there is a factory sending unit in the back of the block behind hte intake and the water temp sender is on the driver side of the head.
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Old 01-09-2009, 05:53 PM   #3
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i dont have any pics, but they are pretty easy to recognize. the water sender is on the driver side head toward the front of the motor.
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Old 01-09-2009, 06:17 PM   #4
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what size threads are the factory senders.just curious because jegs sales adaptors ..
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Old 01-09-2009, 08:07 PM   #5
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i believe the water temp is 11mm.
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Old 01-10-2009, 12:42 AM   #6
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Keep in mind, the water temp sender in the head is for the PCM. If you need a sender for a gauge, you will need to install one in the other cylinder head, or I think you can use a sensor from a 98 LS1, which had 3 wires, two for the PCM, 1 for a gauge. - can anyone confirm this??

Oil sender goes to the instrument cluster in 99-02 or so, and 03+ the oil pressure sender goes to PCM also.
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Old 01-10-2009, 01:14 AM   #7
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***the water temp sender is 12mmx1.50 thread***

Quote:
Originally Posted by busta9876 View Post
I think you can use a sensor from a 98 LS1, which had 3 wires, two for the PCM, 1 for a gauge. - can anyone confirm this??
Yep the 98 had a 3 wire sender, 2 for the pcm and the 3rd goes direct to the gauge.
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"possible" is a relative term around here... anything is possible. It's "possible" to put a whole K3500 4x4 dually truck rolling chassis under a brand new Mini body. Is it reasonable? No. Does it make sense? No. Is it possible? Yes.
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Old 01-10-2009, 08:24 AM   #8
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I used a kit similar to this to thread a standard oil pressure sensor to the LS sender

http://www.autobarn.net/eqoilpreselt.html
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Old 01-10-2009, 01:55 PM   #9
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Quote:
Originally Posted by markarleta1 View Post
can any one post some picks of where the oil pressure and water temp senders on a 5.3 are, i cant figure which one is which also has anybody hooked them up to a dakota digital dash? thanks
I have a Dakota Digital dash in mine. For the oil pressure, you can buy a kit at O'reilly Auto Parts or probably ANY auto parts store that has brass fittings to convert the thread on the engine to the 1/8 pipe thread on your Dakota digital sending unit. For the temperature guage, just go to their web-site and order the 12 MM sending unit and screw it in to the head on the rear pass. side or front driver side if your using a carb as I am. No adaptors are necessary. I would check with Dakota Digital before I tried connecting either one to a factory sender. If you really need the photos, PM me and I'll see if I can find em' for you. Ron

Last edited by rojs234; 01-10-2009 at 02:06 PM.. Reason: added some info
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Old 01-10-2009, 03:02 PM   #10
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Quote:
Originally Posted by busta9876 View Post
If you need a sender for a gauge, you will need to install one in the other cylinder head, or I think you can use a sensor from a 98 LS1, which had 3 wires, two for the PCM, 1 for a gauge. - can anyone confirm this??
If you install another one in the other Head, it will give you a false reading..way hotter than it should be.

I am using the 1998 3-Wire in my setup without a problem, works very well.
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Old 01-10-2009, 05:27 PM   #11
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Quote:
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If you install another one in the other Head, it will give you a false reading..way hotter than it should be.

I am using the 1998 3-Wire in my setup without a problem, works very well.
Could you point me towards somewhere where I could get one of the 3 wire senders.....I'm in the UK, so mail order would be great.

Thanks

Jim
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Old 01-11-2009, 02:57 AM   #12
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I would get ahold of a GM parts store online and see if they could send you it. GM part # 12551708.
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Old 01-11-2009, 12:38 PM   #13
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Quote:
Originally Posted by the_merv View Post
If you install another one in the other Head, it will give you a false reading..way hotter than it should be.

I am using the 1998 3-Wire in my setup without a problem, works very well.
I just had to ask. WHY, would it give a false reading...hotter than it should be. Curious.....is all.
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Old 01-11-2009, 12:48 PM   #14
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Heat soak being where it is on the back side of the Engine, and being at the back of the Heads it gets pretty toasty back there. The Sensor itself gets hot and messes with the reading.

I've tried it and I found it to be true.
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Old 01-12-2009, 12:42 AM   #15
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Was that on your 95 camaro swap that the temp sensor gets heat soaked?

I have my temp sensor at the back of the pass head and mine has always been accurate, but I have a bit more airflow around my motor than you would. That 4th gen engine bay is pretty tight.
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Old 01-12-2009, 01:39 AM   #16
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Yea, that was on my car, and I read that other people have the same problems with a tight Engine Compartment.

I switched the the 3-Wire when I had the time to get it done, and it workes without a problem.
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Old 01-12-2009, 01:00 PM   #17
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Quote:
Originally Posted by busta9876 View Post
Keep in mind, the water temp sender in the head is for the PCM. If you need a sender for a gauge, you will need to install one in the other cylinder head, or I think you can use a sensor from a 98 LS1, which had 3 wires, two for the PCM, 1 for a gauge. - can anyone confirm this??

Oil sender goes to the instrument cluster in 99-02 or so, and 03+ the oil pressure sender goes to PCM also.
Getting ready to do a swap with an 08 5.3.

Will I need to run two oil pressure senders and this 3 wire water temp sender? Why couldn't the gauge and PCM share the same sensor?

Thanks!
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Old 01-12-2009, 01:58 PM   #18
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^^Get you an Oil Pressure Sensor that you can plug the single Wire Connector into and run that to the Gauge.

I would run the 3-Wire Temp Sensor. The Gauges and the PCM share the same signal, well in a way. What happens is the signals go to the PCM, then get sent to the Gauges on the Serial Data Wire. That signal is broken down by the BCM in the Gauges(for 03 and up I assume the Oil Pressure is incrporated into that signal from what was posted above). For the 1998 and back Analog Gauges, each wire ran to the Gauges without a problem.
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Old 01-12-2009, 03:38 PM   #19
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Quote:
Originally Posted by the_merv View Post
^^Get you an Oil Pressure Sensor that you can plug the single Wire Connector into and run that to the Gauge.

I would run the 3-Wire Temp Sensor. The Gauges and the PCM share the same signal, well in a way. What happens is the signals go to the PCM, then get sent to the Gauges on the Serial Data Wire. That signal is broken down by the BCM in the Gauges(for 03 and up I assume the Oil Pressure is incrporated into that signal from what was posted above). For the 1998 and back Analog Gauges, each wire ran to the Gauges without a problem.
I don't plan on using the 08 gauges - I plan on using Autometer gauges with the swap. I'm putting the 5.3/4.60e/harness/pcm/tac into a Jeep Wrangler.

I just went and opened the gauges and they both came with their own sensors. So I guess my question was kind of moot... I'll go back and re-read, but I'll still ask now - where should I put the sensors that came with the gauges and do I need sensors for the PCM as well? If so, can I run the PCM off the new sensors?

I guess I'm asking if the PCM is required to have access to water/oil info. Water I can see for AFR, but oil pressure?

Thanks... I hope I'm not hijacking this thread and just adding to it...?
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Old 01-21-2009, 03:12 PM   #20
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ok, i ran into the same problem w/ the pass side head. on this http://www.ls1tech.com/forums/conver...-5-3-what.html

efilive/ the computer was reading 210 on the driver side head/factory temp sending unit. but the pass side head/autometer gauge is reading 250.eek............ neither side feels hotter than the other.

the merv--do you have a part# for the pigtail for the 3-wire sensor?

alos what wire will go tto the computer and which goes to the aftermarket gauge?
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Old 01-21-2009, 03:12 PM
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