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speedometer problem

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Posted by: greezsmnky

Hi i was wondering anyone know why my speedometer goes up to like around 60-70 mph when i rev the tach up, the speedometer goes up with it. But when i unhook the speed sensor on the tailshaft the tach is fine. And the speedometer is still. This is on my 1988 lincoln lsc mark VII. None digital dash.

Posted by: LuxurySportCoupe

Sounds like you have a bad ground.

Posted by: NYC LS8

Either you need to ground the orange wire behind the speedo cluster or it's a bad alternator.

Posted by: greezsmnky

Quote:

Originally Posted by NYC LSC

Either you need to ground the orange wire behind the speedo cluster or it's a bad alternator.

Thanks for the advice the alternator was bad, put new one on solved problem.