I searched around and found a ton of threads on this but none match what I'm looking for. I have a non-CC LG4, no smog equipment, with the stock air cleaner removed, so no need for EFE (IIRC thats what the thing from the pass. manifold to air cleaner is called). I'd love to get a round thermostat housing so I don't have to mess around with any of the stupid gaskets, and just get a simple O-ring. Both sensors have NO wires, only one vacuum line to the carb and one to some other location (haven't had a chance to track them down). What do they do? Do I need them?

PS - no electric fans either.

 

If it is like Ford it should be a vacuum line to the distributer to prevent the vehicle from overheating at idle and switches from ported vacuum from carb to direct vacuum to the intake manifold. Then it advances the timing. To delete it from the distributer plug it into the intake manifold itself.

 

TVSV - Thermostatic Vacuum Switching Valve

https://www.thirdgen.org/forums/tech...iagrams-i.html

 

One 'sensor' is what tuned posted above. The other would have been your coolant temperature sensor for the ECM. Neither needed if you're running a standard carburetor/distributor.