Change Speedometer ratio | Ford Explorer Forums

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Change Speedometer ratio

jghake

Active Member
Joined
October 5, 2011
Messages
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City, State
Washington
Year, Model & Trim Level
1983 F250 HD 4x4
I know that I can change the speedo ration with a SCT tuner but I have a wifi obd2 adapter that I was hoping to be able to change with.

Do I have to have a tuner or can I just issue a few commands over OBD2 to change the ratio? Right now that is all I am looking to change so $300-$400 is a bit much.
 






Depending on what that tuner is capable of, probably not. You need to get into the ECM and GEM to do that and most off the shelf tuners can't make it happen. You also can pick up a speed calibrator from Dakota Digital or Tru-Speed. They're a bit cheaper than a pricey tuner.
 






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