I hooked up a tach to my 454 big block last night and the strangest thing happened.I hooked every wire correctly only thing I didnt hook up was the tach signal.I figured I would get at least some light to alluminate from the gauge for a test that I was getting power. When I started the engine the mph gauge started to climb and I started to smell the gauge. When I went to shut the engine down it wouldnt stop running even after I turned the key off. Finnally after about four or five seconds it shut off. The gauge had four wires, yellow, red, orange, and green. The yellow wire went to constant power which I hooked to the battery and the red wire went to switched power which I hooked to the fuse in the dash that was marked alt. The orange was optional and the green I left unhooked.
have the same problem?
Monday, June 30th, 2014 AT 9:25 PM