Since my oil pressure gauge conversion from mechanical to electric finally works, I thought I would try and jump to my next project in the conversion. I want to take my stock tach and make it work with the LS conversion. Since my mechanical tach now has no input, we have to give up the mechanical guts and put in some electrics. I have read at some point that someone took the guts out of a 77 or so tach and put them behind the earlier face and made this work.

Does anyone have any idea of who may have done this or how to accomplish this conversion? I don't have a tach yet but I am ready to get on with it. Any help or pointers would be greatly appreciated. I did see it mentioned on one of the forums but I cannot remember where. Hopefully someone can help me through.
Eddie 702009-04-01 19:34:40

I purchased a 75 tach from Corvette Clocks by Roger at Corvette Carlisle. He sold the face with a updated circuit board (not the original which had old electronic technology). I paid $200.00 for everything.......it was more but I paid with cash. He said that I would need the backing plate, that he didn't have there, but would ship to me. He assured me it would be perfect. I received one that wasn't in perfect condition. I really didn't complain, but a week or so later another one came in brand new perfect condition. I wanted a 75, because it looks like my 74 gauges. He sells all the years. The tach was perfect since he completely referbishes them. Here is a link:    http://www.corvetteclocks.com/index_files/Page1605.htm corvette440hp2009-04-02 08:40:18