has all your wiring and electrical been checked for 12v you might have some 6v wiring and relays, switches, etc. or it might be wired up wrong. rick ----- Original Message ----- From: Dan To: tcb@xxxxxxxxxxxxx Sent: Sunday, March 02, 2008 8:33 PM Subject: [tcb] Gas Gauge Question My gas gauge seems to work fine until I turn on my headlights. When I turn on the lights the needle instantly pegs past full. Any ideas as to what is wrong? -Dan