mmarshall

iTrader: (2)

I installed an LS1 in my Daytona Coupe and am wanting to use the Autometer guages. I have tried connecting them and here are the results:

1. Tach - I used the 12v source with the 680 ohm resistor and the tach is erratic and not acurrate. I called autometer and they said to use a 5V source and a 10k ohm resistor. It does not work at all. I then tried a 12v source with the 10k ohm resistor and the tach works pretty well. The problem is the voltage is back feeding into the pcm and the engine won't start or idle. I remove power from the tach line and the engine starts right up. So what is the answer????

2. Oil pressure - LS1 sending unit does not work at all. I bought an adapter and used the Autometer sending unit

4. Oil temp - so far the LS1 sending unit seems to be working ok.

5. Water temp - with the guage hooked up the computer thought the water temp was -30 on a 90 degree day. I disconnected the guage and the computer now reads 90 degrees as it should. Any ideas other than plumbing a seperate sending unit???

Any suggestions would be welcome.

Thanks
Mike

LS102ws6

had similar problem with tach never could figure it out ended up not using one and selling it.

mmarshall

iTrader: (2)

Thanks for the reply. Not really the answer I was looking for though. I am going to try a diode on the tach to see if I can stop the backfeed.

rockytopper

Check wiring diagram for your setup my tach wire is on the C105 RED PIN 10 white tach signal wire. 2002 ls1. The trick with autometer is to switch the tach to the 4 cyl mode and hook this wire up it will work. You will have a slight wiggle at idle but thats all at least on mine. There is apparently a fix for that using a resistor you'll have do a search the very slight wiggle only at full idle doesn't bother me. As for the water you will have to plumb in a seperate unit. Some folks drill and tap the pump others use the plug on the aft end side of the passenger head using an adapter fitting to mount the autometer sending unit. I believe only the elecronic will fit best I recall. A mechanical temp requires drilling and tapping to install in system. Good luck to ya.

mmarshall

iTrader: (2)

Thanks Rocky!

Yes I used red 10 also in 4cyl mode....no dice! I am sure I will figure something out, I always do. I do know selling the car is not an option. Funny I only use the tach on the street. When I am racing I never look at the tach, When you hit the rev limiter it is time to shift.

1bad03snake

iTrader: (16)

I just installed all Autometer gauges in my mustang. I used the white 10 wire for my signal to the tach. I put the big Autometer sender behind the intake and water temp in the back of the pass side head. Everything on my car works fine.

mmarshall

iTrader: (2)

Thanks for that info. I will have to revisit this when I get the car back from the dyno shop.

Andy1

Mike,

For oil pressure, I used the Autometer sender and drilled/tapped the plate just above the oil filer. For water temp, I used an adapter for the sender on the pass side cylinder head. My tach is originally a 4 cylinder model, and I hooked the white tach wire directly to it and it works just fine. Not much help I know, but that's how it all worked out for me.

Andy1

meatheadgn

iTrader: (1)

I put a poteniometer in the 12V source line so I can adjust the resistance until the tach was smooth and read correctly.

As mentioned, I also tapped the aluminum part above the oil filter for the oil pressure sending unit. I believe it is an 1/8 NPT.

On the temp sending unit I took the plug out of the back of the passenger side head and carefully drilled and tapped it for the sending unit. It was pretty easy and I was just careful to drill in the middle of the plug.

rockytopper

Just an FYI for future reference the Equus 9848 Oil Pressure and Electronic Temperature Metric Adapter Kit has the fitings you need to mount the water temp in the head and the oil sender in the factory location behind the intake.

Doug G

So I can hook up a mech. guage in the stock OP hole with an adapter ?

And water temp. mech. guage in _____________ ? (Head isn't gonna work) ?

Pics are always great

1989GTA

So for those that used the plate just above the oil filter did you use a 90 degree 1/8" fitting? Just wondering about clearance for long tube headers.

98TADRIVER

iTrader: (36)

sounds like alot of work for just a tach lol. i always went with the white wire coming out of the pcm, and put the tach in 4cyl mode. Never had any problems

andysfbird

Here are some good instructions from autometer concerning LS1 installations that I found, for what it's worth......
http://www.facebook.com/media/set/?set=a.10150417363640587.618601.282128680586

1989GTA

Thanks for the Facebook link to the Autoguage site. My oil filter block off plate is of a newer design and does not look like the one in the pictures. Mine does not have the boss cast into it where you drill and tap.

However I was able to get the GM part number of the one in the pictures and can order it. Double check but the number is 12551595 if anyone is interested in going that route for their second oil sending unit placement.

mmarshall

iTrader: (2)

Ok my Autometer guages all work now. Here is what I did.

1. Tach - I feel like a fool. As soon as I went to 4cyl mode and no power input through resistors the tach worked fine.

2. Oil pressure - I bought an adapter and screwed the autometer sensor into it using a 90 degree bought from True value. It needed the 90 degree to keep from hitting the back of the intake.

3. Water temp - Bought the Equus 9848 from Oreiley Auto parts and the Autometer sensor screwed right into the passenger side head.

4. Oil Temp - I have the Autometer oil temp wired right to the PCM and it works fine.

Let me know if anyone has any questions about what I did. Thanks everyone for all the help!

Mike