From what I read on other sites....
Yellow Wire - 180* pin on ECU
Green Wire - 1* pin on ECU
Red Wire - 12V IGN pin on ECU
Black Wire - Ground pin on ECU (On PowerFC's you may need to add an extra earth from this pin to the chassis for extra grounding).
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When my Power FC reaches rev limit it cuts fuel and my A/F ratio spikes to 13:1 under high load
. I need a rev limiter and am thinking about going with the MSD unit.