So wait, how does the Ultra Gauge hook up? Is it hardwired to the face/control panel? I've got a Scangauge.
I've always thought it would be cool to splice into the factory harness behind the plug so that the OBDII port could be used while the gauge is still plugged into the vehicle. Have a short cable spliced into the truck, and have the former cable become the spare so when you need to check codes or let someone borrow the toy gadget, there's a free cable.