Haltech IG5 - Manual (Page 20)

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The secondary input can also be used as the Road Speed input if it is not being used as a home
trigger.
You will need to know what wiring your trigger requires. Some triggers need a series resistor
on the power line in order to limit current. Check your trigger system thoroughly. An
incorrectly wired trigger can cause damage, usually to the trigger.
The IG5 requires one trigger input signal per ignition event. For example, a V8 engine will
require 4 triggers per engine revolution. It is recommended that you read Appendix C,
Trigger Inputs for more detailed information on the trigger requirements of the IG5.
1.3.12 Connect the ECU
The ECU can now be connected. The system can now be tested as described in the following
chapters.