How to Wire a Sunpro Tach | It Still Runs Sunpro is a maker of gauges and tachometers, and has been producing these devices since 1935. The tachometer grew in popularity in the 1960s and 1970s with the rise of sport and muscle cars. Tachometers are devices that measure the revolutions per minute (rpm) of the engine. This helps the driver monitor the vehicle HOW TO WIRE A SUNPRO MINI TACH - Fixya Mar 10, 2012HOW TO WIRE A SUNPRO MINI TACH - 1984 Ford F 150. Posted by Anonymous on Mar 10, 2012. Want Answer 0. the negative side of the ignition coil and then use a covered male spade connector to connect the Green wire from the tachometer to the wire tap connector.