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The VSS does not have any voltage supply.
It produces a voltage who's level and frequency is developed according to rotation speed of the teeth passing by the sensor..
Vehicle Speed Sensor!. VSS.
Good luck.
My 92 did similar to yours and it was the connector to the VSS. All I had to do was wiggle it a bit and it was fine. Could be you have an issue with that connector or wiring for it.
I finally got it. I replaced the broken speedo drive gear, but did not have a good picture and being under the truck I did not see the clip that keeps the gear from backing out. I talked with Ken at A & A transmissions in Stockton (he is a beast with manual transmissions/Transfer-cases) and he was exactly correct so am good to go now.
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