V-Twin 39-0392 - Mini 60mm Electronic Tachometer

Electronic three wire type 60mm mini tachometer has a black face gauge without clamp.
When replacing a coil triggered tachometer on 1978-up Vtwins the green negative wire goes to the negative side of the coil. The red wire goes to the ignition side of the key switch. The tachometer head must be grounded by the black wire.
Fits Vtwins:
Custom application