Wiring Diagram for Case 570LXT Loader Construction King

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Hopefully someone can point me in the right direction so I can trace down the issue with the RPM Tach not working. With the gauge unplugged I get about .5v on the wires that plug into the RPM gauge, and that voltage raises as the engine RPM's increases. This seems right to me but I would really like to trace the wires and see where the signal comes from and I would really like to Ohm out or find a trouble shooting procedure to check the gauge itself.

I am sure other Case tractors close to this model have the same setup, any info would be helpful

Thanks Brian

 

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I just wanted to inform everyone that I fixed the tach and hour meter, every connector on the instrument panel needed cleaned, after cleaning all those the tach and hour meter is working great. Still got some more cleaning to do of other things because oil temp doesnt seem to be rising as it should when warm and the hyd warning light doesnt come one when key is turned like manual says. Bulb does work so its not that.