gauges malfunctioning

[Devcon]

Hey guys
I have a 03 roush I bought. Ive fixed all the problems with it, and have now realized that the gauges mph and rpms are off. the mph is about 5 off and the rpms are about 500 off. I think the owner before me had them off for some reason. Is there any way to reset them? the car has stock gears, wheels are 18 inch. Thanks

 

[trombonedemon]

If your gauge is truly off by that much, you have 3 maybe 4 options.

1. Get a held-hand tuner to reset the the speedometer.

2. Get a Tuner to reset your speedometer.

3. Go to the "Stealership," and have them reset your speedometer.

4. Just do the math in your head while driving.

O.p. the only reason I'm thinking that the car's speedometer is off is because of the 18 inch wheels. Would that throw off your speed-sensors?

 

[Devcon]

could the tuner also fix the gas gauge and the rpms? the gas gauge is off by about a quarter of a tank and the rpms are off by about 500 rpms. I think the previous owner took them apart to maybe change the backlighting