A picture of your Tach might help. Teleflex makes a line of gauges similar to the KM tach you have. Sometimes the tach just needs to be re-calibrated. It could also just be the sensor at the engine control box.
Here is a trouble shooting guide for the Series II gauges (if that is what you have)
http://www.epicmarine.com/docs/MDCtrouble.PDFOtherwise, contact Medallion direct. I just had lunch with one of their engineers last Thursday, had I known of your issue, I could
have asked him.
http://www.medallionis.com/ContactUs.html
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One of 4 Previous (Sold) Boats:2000 Four Winns 268 Vista
Current Boat: 2004 Chaparral
235 ssi cuddy
