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Yes with the yellow unit it must have a "bias" voltage applied, on my 6L80 controller I had to run 5v through a 1k ohm resistor to one side of the sending unit. the tach would be doing this already, I have no idea what the black inductive ones were even used for I was thinking maybe the early 4...

The sending unit is super easy to test, just put an ohm meter on it and slowly turn it, it will cycle from open to a short 2 times per revolution. This one is a "pass-through" sensor so I could keep the mechanical tach and give an RPM input to the 6L80 transmission controller. Of course all of...

The most common "yellow" sending unit as I have said before is nothing more than a reed switch and magnet, it will not produce any voltage so a volt meter will not work, you only need an ohm meter and you can test it by simply turning it with your fingers, it should open and close two times per...

The "yellow" sending unit is simply a reed switch with two magnets so it gives one open and closure per crankshaft revolution and would look like a square wave, the other or "black" sending unit is an inductive pickup so it actually generates a voltage that would look like a sine wave, 86 says...