So I have found this site very informative and it has helped with most of my issues. So first I want to thank everyone here. So here is my issue, I have a 1998 K2500 GMC Sierra SLT, 7.4L Ext cab 2 door. The truck has most everything I could want but right away I found the rearview mirror didn't have the Temp/Compass option. So I bought one, installed it, got a wiring harness from a Suburban, and wired it up. Works fine but the temp is reading about ten degrees warmer than actual ambient air temp. So with my limited knowledge of electronics I thought I would ask, is it possible to put a resistor inline to bring the temp display more inline with the actual temp? If so how do I go about figuring out how much resistance I need to change ten degrees? It seems like it would work without very much hassle but I need some advice. I mounted the sensor behind and below the drivers side parking light. I used the original plugs and wires where I could and soldered and covered everything with heat shrink, split loom or electrical tape. I also added the Home-link panel to the OH console, I'm not sure where to pick up the signal to dim the lights when the headlights are on. I thought I found the correct terminal on the convenience center but it works with the dimmer switch for the dash lights not the same as the dim function for the radio display. Thank you for any help.