if you have a circuit tester you can check which color wire is controlled by the dimmer switch in the wiring harness of the headlight switch. or you can test to see which wire is in the radio wiring harness controlled by the dimmer also if that will be closer to the guage installation.
__________________ 2004 DSG Mach 1 w/IUP 5 speed (Born on Date: 10/09/03)
Dyno - 1/28/04 (1300 miles)K&N Drop-in Filter, SAE - 273.8 rwhp 302.5 rwtq
Dyno - 3/6/04 (3400 miles)K&N AirCharger, SAE - 282.5 rwhp 312.6 rwtq
Dyno 4/22/05 304rwhp 326rwtq |