Funny you should ask this. When I first got my truck, it had a blown cig lighter fuse, which is shared with the OBDII port. In order for my UltraGauge to work, I had to replace the fuse. It took me 30 minutes to find the box haha!
2005 Silver 4x2 Supercab XLT 5.4
285/70/17 Cooper Discoverer AT3, 2" Autospring Level