tire size correction question

[shotgun]

Originally Posted by BigSur

This was just posted over on the F150 form but I remembered my password and wanted to post here as well..............


Guys,

I have another question before I place my order if anyone is still willing to help.

I will be specifying my new tire size on the order form for my Gryphon. Will PHP set the unit to compensate for the new tire size or will I have to do it when I receive the unit? I've read a few threads about people having issues with this.

One of the main reasons I want to get the Gryphon is to ensure my factory digital readout for speed, odometer, and fuel economy is accurate considering I have put on slightly larger tires. I have been told that all of the above will be corrected with the install.....and not just the on the unit readout, but also the truck's digital readout as well. I'm hoping this is the case and getting everything set right isn't too complicated.

Any help is appreciated.

Are you referring to the "engineering test mode"?

Ford analog speedometers are almost always high by 2-3 MPH. At least they have been on all my Fords.