speedometer adjustment?????
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Senior User
Joined: Nov 2004
Posts: 234
Likes: 0
From: Mount Tremper, New York
speedometer adjustment?????
well i guess i need to adjust my speedometer in my 91. i got a fast driving award last week, and was informed by the officer that i was goin 64mph, when his radar hit me, i looked and my speedo said about 57. i checked it with my GPS, and well at 57, im goin 61. whatever the case i need to adjust it. does anyone know how to do this...if its possible?? any help is appreiciated
Tuned
Joined: Jul 2004
Posts: 321
Likes: 0
From: Jersey Shore
IM not sure what years started to use computer controlled speedo readins, might be 91' but I kno on my 82' i have to replace the speedo gear thats at the top of the t-case. Theres some formula to calculate it, I have it in my JBG mag, but thats in the truck right now. Good luck man
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
Ford didn't start using the PSOM (Programmable Speedomoter/Odometer Module) until '92. You will have to change the output gearing to the cable. Out fo curiosity, what has been changed on your truck that would put the speedometer +4 mph off. Larger-than-stock tires or something else?
