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Need a 3rd water temperature tapped hole, WHERE?

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Old Dec 26, 2017 | 02:39 PM
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Default Need a 3rd water temperature tapped hole, WHERE?
I need a third drilled & tapped hole for temperature sensor.
Anybody know where one might be located on a 2000 LS1 engine?

Reason is that there is an LS1 engine swapped into my Miata.
Currently have the rear tapped hole on the passenger side head using the Miata temperature sensor to work the idiot gauge in the dash.
Currently have the drivers side front of the head using the factory LS1 sensor to give an accurate reading to the ECU.

Needing a third location so that I can add the aftermarket temperature gauge so that I can see actual temperatures.

The only other option I can see would be if one of the other sensors would work accurately with the gauge sensor but only intend to try that option if there is no viable place to put a third sensor.

Thanks for any help.
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Old Dec 26, 2017 | 02:57 PM
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What about using a TEE fitting if it will fit?
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Old Dec 26, 2017 | 02:59 PM
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I considered that and might do it.
Only concern is getting an accurate reading when it is not in the actual coolant flow path.
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Old Dec 26, 2017 | 03:18 PM
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Possibly find a spot on the water pump itself; Looks like there might be a few places that would work.
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Old Dec 26, 2017 | 03:19 PM
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Was hoping for something already drilled & tapped.
Could go that way if absolutely required.
Anybody have a picture or thread that shows the best location to drill & tap?
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Old Dec 26, 2017 | 07:13 PM
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Are you running the steam line to the radiator? If so would it be possible on your setup to T a sending unit in someplace?
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Old Dec 26, 2017 | 07:55 PM
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Rear passenger side head has the same port as front of drivers side head. Why not use that?
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Old Dec 26, 2017 | 08:56 PM
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Originally Posted by Darth_V8r
Rear passenger side head has the same port as front of drivers side head. Why not use that?
We have a winner.
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Old Dec 26, 2017 | 08:57 PM
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Originally Posted by qweedqwag
We have a winner.
I think the OP stated earlier that port was already spoken for.
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Old Dec 26, 2017 | 09:07 PM
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I missed that
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Old Dec 27, 2017 | 11:59 AM
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What about swapping one sensor out for a 3-wire sensor?

-KP
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Old Dec 27, 2017 | 01:15 PM
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Care to educate me on that option?

Are you saying that there is a temperature sensor that will do double duty?
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Old Dec 27, 2017 | 01:24 PM
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How about, drill & tap a core plug hole, and use a brass bushing.
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Old Dec 27, 2017 | 01:33 PM
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Yeah.

I used to run a temp sensor that had 2 outputs.

It's actually 2 sensors with a common ground.

Someone will know the part #, I'd bet. I don't...

-KP
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Old Dec 27, 2017 | 01:36 PM
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Here ya' go:

https://ls1tech.com/forums/conversio...t-numbers.html

http://www.rockauto.com/en/parts/acd...+/+sensor,4748

https://www.ebay.com/itm/LS1-Coolant...-/162150183478

-KP
Last edited by kpeters59; Dec 27, 2017 at 01:49 PM.
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Old Dec 27, 2017 | 01:49 PM
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Just gotta love the internet and helpful people and forums.
That link gives me what I need to get there.
Thanks.

Bruce
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Old Dec 27, 2017 | 01:50 PM
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See the edits...just don't ask me to install it!

-KP
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Old Dec 28, 2017 | 08:30 AM
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Another idea for your project is to run an in-line radiator hose adapter for your sensor.
http://www.summitracing.com/parts/flx-32082/overview/
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