86 Buick Regal electric speedometer not working

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Jun 24, 2018
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My speedometer and gas gauge are reading incorrect numbers. I currently have 37 gallons and going 78 when I’m going what i believe is 40mph. Not sure if it’s wires or a fuse?????
 

UNGN

Comic Book Super Hero
Sep 6, 2016
3,048
3,264
113
Southlake, TX
It sounds like the digital dash has switched to metric.

Your only real option now it move to Canada.
 

UNGN

Comic Book Super Hero
Sep 6, 2016
3,048
3,264
113
Southlake, TX
The gauges been moving up and down, i had 51 gallons the other day

Does it say "Gal" or does it say "L"?

If it says "L" the dash has accidentally been switched to metric. Push the trip odo knob in and Turn it to return it to SAE units.

Varying gas tank level could be a bad fuel tank sender. If its kind of close, I'd live with it until its way off. I guarantee you won't like what you'll find when you change out the sending unit. Probably a new tank and new sending unit will be needed. Good thing these are reproduced and not that expensive.
 
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