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1968 buick wildcat wiring issue


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I needed to get a gauge cluster for my 68 cat but i was only able to find one for a 68 riviera. I went ahead and bought it but it doesn't seem to work real well. most of the circuit on the back lines up with the old one but it behaves weird with the light switch. When i turn on the headlights the gauge lights turn off and the dimmer switch brightens and lowers the generator light. is there a way i can make this gauge assembly work? 


Also it seems to run kinda shakey and bogs off the line.

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 most of the circuit on the back lines up with the old one

did you compare the 2 in the factory shop manual electrical diagram?  But the speedometer is mechanical so it soundclike the unit will need some servicing.

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