Quote:
Originally Posted by abig84
i remember tearing apart a 89 1ton years ago and it had a goofy sensor in the back of the speedometer, kinda looked like a electric eye that twisted into the back of the gauge, and i was told it was a VSS. ever hear of anything like that?
i think its the one i have in my 86 now, its got the trip but its broken
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Yes, that would be a VSS (Vehicle Speed Sensor). I believe they were first used in these trucks starting around 1983 when equipped with cruise control. I think they were also used for the engine control system on 87+ trucks with fuel injection.
When the electronic speedometers were introduced, the VSS was moved down to the transmission where it took the place of the speedometer cable drive.