Trail Tech recommends a 600K .25W resistor, and they sell a tach lead with one installed. I use one, and my tach isn't jumpy at all. I wired the red resistor wire to the bike's black tach wire and the black ground wire to the bike's accessory ground wire. All this is inside my headlight bucket.
Last futzed with by Chicagobob; April 15th, 2013 at 07:05 AM.
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