I have an 87 L98 TPI and I just put the new motor back in but my temperature guage isn't working. . . where is the connector inside the engine bay??? it is somehwere near the back of the intake manifold, right? oh well, thanks guys

 

The Coolant temperature sensor is located on the passenger side below the exhaust manifold towards the back of the block! I hope this help!

 

Ummm.... No. The sending unit (or sensor as some people call it) for the gauge is located in the driver side head between the #1 and #3 spark plugs. It has one green wire leading to it. The one that Say'n Somthin is referring to is the switch for cooling fan. There is another one that is threaded into the intake manifold above the water pump that has black and yellow wires leading to it and that is the one that inputs the coolant temp to the ECM.

Laterzzz,
Matt

 

Nice catch there Matt.

 

FastBird6point3, Sorry about the misinformation. Thanks Mike for the correction. I feel like an idiot now!