The mini onboard tachometer uses the pulse from the HALL sensor to give a bright display of the engine's R.P.M. x 10.
The supply for the unit is taken from the Ignition battery so no extra battery is required, but it can also be supplied direct with a voltage range 3.5v to 8.4v at a current of 25mA and a rev range up to 30,000rpm.
The window size 41mm x 17mm x 12mm makes it a very compact unit.
A "y" lead is supplied with the tacho to connect it with the sensor and the C.D.I.