Hi, im in the middle of wiring up some ISSPRO gauges for my 08 6.4 and Im currently stuck because I cant seem to find another 12v key on power source under the dash, drivers side on the "customer access bundle". I currently though have an HS mini maxx tapped onto the purple/violet wire that works just fine. Can I run my gauges off that purple wire or could that interfere and maybe cause a voltage drop? Anyone have any thoughts or ideas? Ive tried using a DC volt meter and havent had any luck testing wires with the key on. Should I be using a test lamp lamp for this? Thank you.