From the Wiki
Quote:
Installation notes:
For Identifying where to tap into the fuel injector:
1. turn on the ignition, leave engine off.
2. Unplug an injector.
3. With a voltmeter, measure the voltage on each injector connection. One should be 12 volts and the other should be more like 0.
You will want to tap into the one that is at 0 volts.
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But it shouldn't matter which injector.