Speedometer not reading properly

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Carl 1/27/2017

1986 Ford Mustang GT 8 Cyl 5.00L

Engine

Speedometer not reading properly

Speedometer reads about 35mph , but your actually doing about 50mph. Help please

2 Answers

Ray 1/27/2017

Improper tire size could cause this.

Carl 1/28/2017

Yeah I checked they are the correct size. Any other ideas? Thanks

marzak 1/28/2017

is there a selector for mph and kilometers on the dash ?

Carl 1/28/2017

Yeah I checked that, but it doesn't. That was a good idea though. thank you anyway