After an engine swap or cluster swap on your car you might find a different RPM range on the Tachometer.
This controller box allows you to solve this problem just by selecting switches (check table on photo).
As you can see on the second photo of this ad our controller box has 4 small switches inside. Just choose the desired switches positions for the application you need.
For example: if you had an original 4 cylinder car and installed a 8 cylinder engine you will have a 2000 rpm on your tachometer when your engine is at 1000 rpm. Our controller box will solve this problem !
This controller box is very easy to install. You only need to connect 4 wires as explained on the instructions included in this sale.