[Peter Serio]

This is the bracket that is on the back of all 67 Pontiac A body car gauges. It is the same bracket regardless of if the car has standard gauges or rally gauges. (This bracket is a one year old part. ) It serves 2 purposes, one it's a support bracket for the center of the dash bezel and 2 it is the ONLY ground from the gauges to the body of the car.


As far as this problem goes; & in light of the last several posts I am now leaning towards a bad ground or grounds in one of the tail lamp sockets. The current then back-feeds thru the bright filament in one of those #1157 bulbs then into the wiring harness and then into the dash filament of your turn signal arrow bulbs which both share a common ground. Those tail lamp plastic sockets have a spring tension ground tab on the sides of them where they plug into the tail-lamp housing. The tail lamp housings on a 67 GTO are cast potmetal attached and grounded to the body of the car at the rear body panel. The spring effect of those ground tabs gets weak over time and you loose your ground to the bulb socket. Over the years 1967 GTO tail lamp lenses can trap & hold water and the ground tab on the lamp socket(s) will rust and break into 2 pieces from moisture condensation.