So in the last two weeks my 4runner's (95 3vze) Speedo has gone haywire...like it works, but bounces all over the place...like +/- 10mph...i'm assuming this is a loose ground on either the gauge itself out the sensor...has anybody had this problem and is able to tell me i'm completely wrong/ way it actually is; or if out is the ground on the sensor, where would I find said wire? Thanks y'all