SOURCE: under power my tachometer jumps and the
I had the same thing on an 08 883C and on it's first run too. Cause was metal scurf lodging in gearbox speedo sensor, disabling it. Tacho kept going as it's separate. Your engine warning light may also show. I suggest check your oiltank level, and if OK, ride home and arrange to change gearbox oil. This may fix it. If not the sensor can be changed for a small price.
SOURCE: 2003 Harley Davidson Sportster 1200 Custom Tachometer kit
The only idea that i can come up with is that you dont have a good ground..or the guage was bad when you bought it..i hope this..Keith
SOURCE: The tachometer on my 2001 Sportster 1200 suddenly
Check the wires going to your coil. There may be a pink wire going to one side of the coil. If that wire is loose, your tach may not work. Also check the power wire, usually orange.
Good Luck
Steve
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