Guages acting weird

[Madracingalley]

Gas Guage... Goes from F to halfway.. Halfway is Empty
Temp guage doesn't work at all
Speedometer Is 15% off

How do I correct this stuff

 

[KELLY88]

Sounds like a bad ground somewhere in the electrical system. At least for the gas and temp gauges. As for the speedometer it's either that or if you're running different sized tires than stock and didn't recalibrate the computer then the reading will be off.

Love the Ron White sig by the way

 

[Madracingalley]

The tires are the correct size

P195/70/R14

maybe its suppose to have 15's?!