I recently took a trip to Michigan and back to Georgia. Before I left I had my Predator on 85 with wheel mod to 245-75-16 stock tires. I put a lower tune on with the same mods to 65, before the trip.. During the trip I noticed that the truck was 4.5 MPH more than the GPS, during any speed range. Is there a way to true the Speedometer to the GPS?? Thanks

Yes you can calibrate your speedometer with your GPS. What size tires do you have? I had a Predator and the settings are not accurate, I started with the tire size correction where I thought it should be and just adjusted a little at a time until I got it rite.

Thanks LWATSON! I'll try it. Sounds Good.