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I have the RX-8 tech service manual but I don't understand the wiring schematic. I'm trying to install the Apexi RSM and I need to know the location of the wire that tells the ECU speed, RPM, and a ground and IG power wires. I already tried to talk to Canzoomer. So if some could help me or explain the wiring diagram in better terms it would be alot of help.
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Dude, electrical can be REALLY BAD if you mess it up. If you don't understand the diagrams, I strongly advise you not to do the work. Clearly you already know this, because you're trying to gain more understanding. That's good, but I'd still say just take it to a car shop and have them install it. Plus, that way it's their fault if it's done wrong, so you aren't out all the money for a new ECU, wiring system, etc.