My Landlord has an 07.5 GMC, SLT he ordered a triple gauge pod and boost, EGT, and fuel psi gauges, where should we tap in for power for the lights on the gauges? Also where are you guys going through the firewall?
I would do a fuse tap where the illumination fuse is, that way your dimmer switch works for your gauges as well. I went through the firewall at the grommet where the harness comes through at.