Adapting 81+ Temp Sensor to 79 Gauge? -
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post #1 of 5 Old 08-14-2009, 03:00 PM Thread Starter
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1979 CJ7 
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Adapting 81+ Temp Sensor to 79 Gauge?

I'm using 81+ exhaust and intake manifolds on my 79 258. The later ones are coolant heated. I'm wondering how to run the coolant temp sensor. Here's a picture.

It has two wires, whereas the original sensor for the motor had a single wire. Unless this isn't what I think it is - in which case, what is it?

There is another fitting that looks similar to my original temp sensor which is on the back of the intake.


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post #2 of 5 Old 08-14-2009, 03:15 PM
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Why aren't you using the original temp sensor?

You shouldn't have to change a thing in regards to the temp sensor just because the newer manifolds are used.

The switch in your picture is the one that is used by the computer to tell the computer controlled BBD carb to go to closed loop. It isn't used for the temp gauge.

The other sensor you're seeing is probably the one that controls the electric manifold heater.
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post #3 of 5 Old 08-14-2009, 03:21 PM
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If its a temp sensor, one is a ground, the other signal. On GM style sensors, yellow is signal, black is ground. It does look like a temp sensor to me, but im not 100%.

My jeep gives a whole new meaning to the phrase, Just Empties Every Pocket!

1975 Jeep CJ5 258 TBI EFI, T-18, D-20, D44 rear, 4.11.
1992 Jeep Cherokee 4.0L, AW4, NP231 October 2009 - August 2012
1998 Jeep Cherokee 4.0L, AX15, NP231 - August 2012
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post #4 of 5 Old 08-14-2009, 04:23 PM
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The temp sensor for the gauge is on the back corner (drivers side) of the head.

The other two sensors are as CSP said -


'86 CJ7 - 258 - Howell - 'Rushed' - 2.5" sl, 1" bl - T5 - d44 rear - 33 x 12.5
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post #5 of 5 Old 08-14-2009, 04:47 PM Thread Starter
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Thank you, that's kind of what I was thinking but wanted to make sure.
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