I've got 35" tires on my 94 F-250 7.3 IDI...I need to calibrate my speedo so I can keep my mileage straight for oil changes and stuff...I've seen it posted before on how to do this...Only problem is I don't know what they're talking about when they say grounding some connector under the glove box...I know how to ground something but I just need to know what to groun...Hope someone can help...Thanks


wesley

 

There is a single pin connector at the bottom middle of the glovebox compartment.