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There is NONE. No one that I have spoken to or known to have a vehicle like this has ever done some custom job. Perhaps something could be done with the clock as in replacing it with a tachometer, but I haven't seen one. Aftermarket is your only source, and they look pretty gaudy placed on the console or dash. Not that there is any real room for a tach. As mentioned above why do you want one? Are you racing with it? Bouncing it off the line? Otherwise a tach will do very little as these cars and their BIG engines were NEVER meant for speed in any sense. They were slow turning torque engines. Meant to pull boats or trailers or waste a lot of gas cruising down the road. Also remember the transmission too was never really designed for modern highway speeds either. The C6 was a 3 speed transmission. First and second being very quick before you hit 3rd.
