The one that works for the ECU.. it's the front facing one correct ?
2 wire facing up is for the A/C...
1 wire smaller ones are the dummy light and gauge correct ?
What's the thread size for this sensor ?

I read the newer ones use M12x1.5 or the 3/8 NPT...
But think I seen the one I have ( 1990 3.0 v6 ) has M12x1.25 ?
I am in need of the ECU sensre or make one from another vehicle work.

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91 (Gen1) Monty, 3.0L V6, Auto 4 Door.
Disabled Driver.