The
most essential and most useful instrument needed for a car is offered in
its electronic version.The circuit is reliable, highly accurate and easy
to assemble. The engine revolutions are counted and the result is displayed
on a four digit display. Engine revolutions in the range between 0 and 7000
r.p.m. are measured.The circuit can be installed in almost any car due to
its small size. Dissipation current: 180mA. V 12 VDC PCB 39x65mm