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Now I'm in the process of "winding up" the speedometer. I've opened these before but prefer to keep this one a "virgin" and do it electrically... According to my basic math, I have 53 days to go before I hit 112K miles at this speed. It will be ready just in time to drive the 993 to the Canadian Grand Prix...
So I'm curious. If 12V signal tops this thing at 60 miles per hour, what type of signal does the speedometer get to indicate higher speed. And where does this higher voltage come from? Are they using some sort of step-up transformer in the sender unit?
Not sure. But when I lowered the voltage to 9V, the speed went down to 25-30MPH. I did not want to increase it, because I was afraid I might fry the board and speedometers are spendy. I also tried connecting an additional 12V source to the other pins but that didn't seem to change the speed.