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DATAP R O-45™

The actual power supply voltage may vary from 11 to 18 volts DC. Any standard automotive style battery is sufficient. If your car can not provide the suitable voltage, or doesn’t have an on-board battery, then order a battery pack from Computech. Under normal operating conditions, less than 200mA will be drawn by DATAPRO-45™.

It is recommended that the power connection selected will provide power to the DATAPRO-45™ even when the engine is not running. Leaving the DATAPRO-45™ powered up for an entire day of racing will have very little effect on the vehicle’s battery.

TESTING: Test your power supply connection by checking the DATAPRO-45™ display. If it’s on, everything is fine so far. If the display is still not on, check the troubleshooting section.

1.4.2.

Engine RPM

WARNING: Ignition suppression spark plug wires are highly recommended. Without them, proper system performance is not guaranteed. Consult your dealer for more information on suitable spark plug wires.

DATAPRO-45™ senses your engine RPM electronically by tapping into the ignition system. Due to the wide variety of ignition systems, every installation is slightly different. Every effort has been made, however, to make your installation effortless. Select one of the scenarios below for your installation.

Regardless of your situation, you need to connect a 14-16 gauge automotive wire (violet color is recommended) from the chosen tachometer signal to the junction box position B3.

1.4.2.1.

Installations having an electric tachometer

If you have an electric tachometer then the easiest method is to simply pick up the RPM signal directly behind the dash by tapping into the electric tachometer's wires. Most tach manufacturers choose a green wire for this signal.

1.4.2.2.

Ignition systems with a dedicated tachometer output

Many CDI, electronic, and computer ignitions (such as MSD) have a dedicated tachometer output. Connect to this output.

1.4.2.3.

Conventional style Ignition systems with external coils

If your ignition has an external coil, then that coil will have one high-tension spark plug type wire (typically plugged into the top center) and two low-tension smaller wires

Copyright 1999 Computech Systems Inc

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