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73-87 Chevy _ GMC Trucks => Interior & Equipment => Topic started by: beastmode86 on June 11, 2015, 12:45:46 pm

Title: Need Help with Speedometer Calibration
Post by: beastmode86 on June 11, 2015, 12:45:46 pm

Hey guys i'm having problems with my speedometer not reading correctly. It seems to be reading double the speed. First off I have a 86' C10 TH350/350 with 3.73 gears, I am running 20' s also. I have a new speedo cable, I've done the math and gotten the correct tooth count driven gear, I also have a new speedometer. I've seen some comment about re-magnetize the magnet in the back? Can anyone help me out?

Title: Re: Need Help with Speedometer Calibration
Post by: TerryY on June 12, 2015, 02:00:14 am

Find a speedometer shop. Have the cluster ready to take out so there is no removal/installation charges and it should be fairly inexpensive.

The adjustment of the magnets and cup is a pretty touchy thing and without a reference speed source it would be impossible to get it accurate.

Simpler is that if you have a phone with GPS just add a speedometer app and use that mounted on a bracket. I like DigiHud and use it in about everything because out of the 7 cars I use none of them are right.