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Have you Alt tested for a bad diode. They still put out, but have an irregular pattern and lower voltages. That would bounce your tack all over the place.
My thought is this may be electrical in nature. I would test with an external guage. If your engines have points, make certain they are in good condition. I suggest considering upgrading ignition to electronic, but that has nothing to do with this event, necessarily. Points are just always out, slightly.
Another test, before anything, may be to reverse the inputs on the Floscan and see if the problem moves or stays. If the problem moves, the starboard ignition is suspect. If the problem does not move, the Floscan may need repair. Make sure that you have tight and clean connections and good grounds.
2005 BUICK LESABRE TACHOMETER DOES NOT REGISTER WHEN ENGINE IS RUNNING. SOMETIMES IT BARELY MOVES, THEN GOES BACK TO 0
SAME CAR HAD SPEEDOMETER QUIT, REPLACED WITH NEW SENSOR, DROVE ABOUT 1300 MILES AND IT QUIT AGAIN. CLEANED THE SENSOR, WORKS OK NOW.
the dash voltage egulator probably went bad. First,check the battery & make sure you have 12 volts,not running. Check it again running & you should see about 14.5 volts. If that's good,I'd replace the guage assembly.
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