Anyone have a actual size template for the back of the tach. I'm replacing the dash gas gauge with a tach and I'm not having any luck getting the template the way I want it. If any one has a template laying around that is actual size and scan a copy to email me, I'd appreciate it.
Mine was not marked. but I made a template. I just cut out a piece of cardboard (cereal box) and kept trimming it until the tach fit. then I made reverse of that, and had my template. I don't have a scanner, but if you email me your address, I'll send you a copy. It has the bolt hole location, also.
All dashes are "marked". The marking is very difficult to see. The area to cut out is a little more flat in color than the surrounding area. You have to hold the dash up to a bright light and tilt it around until the light hits it right. Then score the outline with a sharp object.
It looks like GM used the same mold for all dashes and then inserted a plug when they did a run of standard dashes.