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Hyper tach 1800

If the 1800 tach is like the small one mounted in the 240 1980 vintage there is a small adjuster screw that you can trim to a known good tach RPM reading. I used my old Sears engine analyzer and matched the gauge reading to it. A small amount of turning changes the pointer position, go small amounts at a time.
The adjuster is not labled on mine, but its there, a small silver screw type pot. Good Luck...
Chuck Jaxel
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Chuck Jaxel, Pine Hill NJ, Near Philly...






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