Join Date: Feb 2002
Location: N.W. Washington
not sure if 67 is same as a 68, although i'm sure it is, but the center screw that holds the gauge cluster to the dash is also for grounding. if that screw is loose or missing, it acts like you describe. if its there and still tight, take the cluster out and clean up the ground, and the surface it contacts, make sure its a good contact. there is a piece of metal that comes from the printed circuit area (metal part) on the gauges, and bolts under the plastic face to the metal dash, with that screw. make sure its there and clean. if this just started, i bet its just a loose ore bad ground at this point. good luck
1968 rs with an old school 354" SB2.2 pump gas motor.
Repetition does not transform a lie into a truth.
Franklin D. Roosevelt