Just got my new gauges from Geno's. I went with the Isspro egt, boost & trans temp for my 97 2500. Could someone recommend the best place to tap into the dimmable lighting source (for the gauge lighting) and the ignition hot. I was going to use the lighting source from the dimmer switch and the Ign source from the fuse box. Any advice from someone who has already done this install would be appreciated.