If your vehicle has an after-market ignition –some systems will connect to the TACH output terminal.
If your vehicle has a computer controlled ignition system, consult the service manual for the wire
color and location.
If your vehicle has a magneto system, connect the tach signal wire to the negative side of the coil. Do
not connect the tach terminal to the positive (+ or high voltage) side of the ignition coil.
This connection is either Normally Open (Blue wire provides ground AFTER the switch reaches desired
RPM) or Normally Closed (Blue wire is grounded UNTIL switch reaches desired RPM) according to the
setting in program mode (OFF means Normally Open and will supply ground when the selected RPM is
reached, ON means Normally Closed and the switch will open when the selected RPM is reached). Factory
default is Normally Open.
OPERATION:
The unit comes with a factory setting for an 8-cylinder engine, with activation at 5000 RPM Normally
Open. The display will stay in Settings Mode until it receives a signal from the ignition system. To
program the unit after starting the engine, shut the engine off and turn on only the ignition.
When in Settings Mode, use push buttons on the device face to change the RPM switch setting in
increments of 100 RPM at a time, up to 9900 RPM. The left button increases, while the right button
decreases. Once you are at the desired setting, the LED display will stay on the RPM setting for a few
seconds. After you have finished, the readout will continue to display your setting for a couple of
seconds, then it will proceed to the next setting which is the Deactivation setting. After setting the
desired ‘turnoff’ RPM, the unit will then jump to the NO and NC settings. Finally, wait a few seconds and
the device will move on to the final selection, number of cylinders. The device is programed for use
with 4, 6, and 8-cylinder engines. Use the left button to make your selection after the unit is done
displaying the NO/NC status. When you are satisfied with your settings, start your engine and your
device will start to operate automatically.
A blue LED will indicate when the switch is activated.
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