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1986 944 Odometer signal

Electrical

Vehicle Information: Year: 1986; Engine (type, size, modifications): 2.5l; Total Mileage: 158,000;

The odometer does not work including the trip meter. Yet the speedometer and tach work. I removed the instrument cluster and tested the odometer motor, with 12 volts applied to it, it works and the reset works as well. The connector at the sender unit near the drivers side axle has 12 volts at that end, what is the signal that should be coming from the sender unit? A voltage pulse?There are 3 wires at the sender unit, (+,A,-). Is "A" the output? I can't find the sender unit on the factory wiring schematics, do you know what sheet it's on? I'm trying to figure if it's the sender or wiring to the cluster or circuit board at the cluster.

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