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**mikey531** · 10-03-2009, 06:41 AM

My speedometer is off too so I used my TomTom GPS to find out the speed I was really going. It shows mine being off about 10 MPH with a turbo 350 and 4.10 gears. The speedometer in my 2000 GMC is off a couple miles per hour too. I am going to use this chart when I get the ambition to change mine.

http://novaresource.org/speedo.htm

10-03-2009, 06:41 AM	#4
mikey531 Senior Member Join Date: Jul 2009 Location: Exeter, NH Posts: 795	Re: my speedometer is off what to do? My speedometer is off too so I used my TomTom GPS to find out the speed I was really going. It shows mine being off about 10 MPH with a turbo 350 and 4.10 gears. The speedometer in my 2000 GMC is off a couple miles per hour too. I am going to use this chart when I get the ambition to change mine. http://novaresource.org/speedo.htm Last edited by mikey531; 10-03-2009 at 06:46 AM.