On the older TPI apps ($32) there is 4 coolant sensors. 1 head goes to gauge, one head goes to fan switch, front of intake has two. One goes to ecm (which one?), the other goes to ???

I'm gonna repin my vette to a '730, and replace one of the front coolant sensors with the later style sensor and plug, but need to know which sensor is for the ECM, and wtf the other one goes to. None of my fbody or ybody manuals have 2 sensors listed in the intake, but i've seen NUMEROUS older TPI setups with two.

-- Joe

 

the coolant temp sens has black and yellow (same at newer TPIs)

i guess the other one you're talking about is the cold start switch - if you convert to 730 ECM, just leave it blank, you don't need it anymore (the cold start function is included in the software of the $8D mask)

 

Yup exactly the other one is the cold start temp sensor. It should be the one more to the left.