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240 tach question 200

posted by  jonny2box on  Wed Aug 4 18:09 CST 2010
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last visit: Tue Sep 30 00:37 CST 2014
[RELATED]

hi

i just bought a rare accessory tach (the small gauge) off of ebay

i wired it up (pretty sure correctly) all the other gauges i've installed worked and continue to work after taping into the 12v, ground and brown light bulb wires.

but for some reason this gauge wont work. are there any usual culprits ? like a resistor i can swap out or a test i can do to check if in fact it's the gauge that is broken or if it's the red/white signal wire that is faulty behind the dash ?

what would be the next thing to check here.

i once bought a oil pressure sender from a guy who put a volt meter on the body and the gauge wire terminal and said if the resistance was infinity it's broken but if you can get a reading its working fine. Is there any similar test for these small gauge tachometers ?






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