Need Info on Signal Taps

fastsc92

Registered User
I'm tapping into signals from the EEC for my wideband data logger. I've got the ECT, and MPH, but now i need RPM and MAF voltage. I know there are two wires for the MAF, but only one gives a valid signal. And also i need a singal for the RPM. I know there is one behind the dash, and at the DIS mod., but there must be one at the computer as well. I just cant seem to find it on my wiring diagram.

So the two questions are MAF signal and RPM signal. Thanks guys.
 
maf

light blue with red for the MAF voltage, but check with a voltmeter to make sure. Should get 1-2 volts at idle. For RPM, I tried DIS wires and at tach, but could not get clean enough signal. Try wrapping a wire around #1 spark plug.
 
is there a RPM signal at the EEC plug? I'm tapping all my wires from there, and would like to keep it at the same place.
 
maf...

The light blue/red wire is on the MAF harness. Not sure on the eec where the pin outs are for data.
 
I got the MAF signal figured out, but i really need to find a RPM signal at the computer itself.
 
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