Do you have aftermarket rims/wheels? Are you saying that even while at idle, you speedo reads 20mph? For the gas gauge, that's an easy fix, fill up the tank and move the needle to full.
it goes up to full and goes down to half a tank but doesnt go any further than that so when i hit half of a tank its really on empty, the guy said this stuff started happening when he put the new cluster in it before i bought it
ok, i think that i know how i can fix my gas gauge ill run it till the light comes on then push the thing down to empty, but the spedo goes down to 0 when im not moving but as soon as i start moving it goes to 20
