Electrical problem
1992 Acura Vigor 100,000 miles
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I got a engin put into my acura and they didn't ground my battery right. It would run but when i would turn my lights on the care would almost turn off. After grounding the battery properly everything was working fine except my speedmeter and my gas mileage counter. The other speedmeter works but the one that tells me how fast I'am going does not. Do you know what can i do to fix the problem?

Thanks for your time.

Jonny Blazz