Seller notes

This is an early Sun Tachometer (Volts Mag), RF-1 model, for 1,2,or 4 cylinder engines with magneto ignition, typical 4 cylinder tractor engines. The tach measures up to 6,000 rpm, and does not require a sending unit, adjustment knob built into back side. Front chrome bezel measures 3.785" diameter, and tach body requires a 3.442" diameter mounting hold (or a smidge larger)....

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