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Thread: Speedometer help.
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07-31-2019 #1
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- Join Date
- Dec 2014
- Location
- Murfreesboro, Tennessee
- Posts
- 134
Speedometer help.
Having issues with my speedometer. The car is a 71 Formula 455 and a new speedo from classic industries. I am running a T56 with a Cable X box to drive the factory speedometer. I have the box set to the proper settings for my tone ring. I took the car for a test drive to compare it to gps. The odometer is just about dead on. The issue comes from the speedometer part. When I'm hitting about 35-37mph as indicated by gps; the speedo reads about 20mph. I'm thinking there's an issue with the speedo, but I am not sure considering the odometer reads correctly. Any thoughts or suggestions will be greatly appreciated.
1971 Firebird Formula 455HO 6 speed
2017 GMC Sierra Denali Ultimate Pearl White 6.2L
2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)
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