SOURCE: oil drain plug
Follow the hose that goes to the frame from the oil tank. Loosen the clamp and pull.
SOURCE: I have Harley Davidson 2000 Sportster 883. I
Neg cable corroded thru.
I bet you have 12v at the battery and less at the other end of the neg cable.
I had the same problem.
SOURCE: 2003 Harley Davidson Sportster 1200 Custom Tachometer kit
The only idea that i can come up with is that you dont have a good ground..or the guage was bad when you bought it..i hope this..Keith
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