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Discussion Starter #1
I installed my vpc/safc's rpm wire into pin 58. That's the pin that the TT guys use. But I was reading the NA OBDI write-up and it says to use pin57 as the rpm wire. I dunno which one to use really. I've already wired it into the ecu and I'm not sure if it even matters.

I also have my 2-step turbo timer into pin58 and that seems to work. What's the diff between 57 and 58?
 

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11,221 Posts
Discussion Starter #5
streetraser2002 said:
i think 57 is rpm1 and 58 is rpm2. i don't think it matters
Yea I dunno. I just wired it up the way the TT guys do. I guess it doesn't matter, so I'll keep it the way it is. My SAFC seems to be acting up (no matter how much I change, the a/f is the same), so I'm rechecking the wiring and making sure everything's ok.

Everything checks out except for that 57/58 pin so I just wanted to make sure that wasn't the problem.
 
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