H Tachometer ??

FBH44 · Oct 16, 2013

Bought an old instrument cluster at yard sale, it might be from some locomotive. Has a "Bendix-Westinghouse Air Brake" 1-150# air pressure gage, a "Twin-Disc TorqueConverter" 100F-250F temp gage, and places for a throttle indicator, a water temperature indicator, lights, etc. But is also has a Westberg tachometer labeled "RPM-hundreds", 0-3500 rpm. Has three wires on back, as near as I can see the old masking tape labels read "Ground" and "Coil". Unknown third wire. Any advice, pro or con, where I could hook it up to a 12 volt H, see if it works?? Do NOT want to damage anything, or smoke anything.

Janicholson · Oct 16, 2013

The third wire is probably the illumination. It could also be the power input to the tach. Look at the cluster and see if there is a general lighting system, or independent bulbs. Jim

FBH44 · Oct 16, 2013

Thanks Jim. There were small lights left and right, about 1 inch away. Only the broken sockets are left. I wonder, if that "Coil" designation is correct, since I have a 12 volt system with a 6 volt coil and resistor, exactly where should I connect??

Janicholson · Oct 16, 2013

On the distributor side of the coil. It needs a signal to "count" revolutions that signal is located there. If it is 24 volt it might not trigger, if 6v it might be OK. Jim

H Tachometer ??

FBH44

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Janicholson

Well-known Member

FBH44

Well-known Member

Janicholson

Well-known Member

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