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Old 03-08-2011, 10:56 PM   #2
Paul P
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What I Drive: 2001 ZX3, 71 Chevelle 408

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What you have only has a 0-4V scale from what I have been reading. The SCT XF3 needs an analog range of 0-5V. The other thing that is not defined is the range of AFR from 0-4V so if you can tell me that I might be able to figure it out. On the innovative MTX-L that I have it is 0V=7.35AFR and 5V=22.5 so the equation for this is (v*3.008)+7.35. I"ll check the SCT manual tomorrow for the equation formula.

This is the SCT 1394 cable pin out


This is your Auto Meter 3378 wiring.

Black Wire(Ground):
Connect to good engine ground.
Brown Wire(Optional Peak/Recall & Warning WOT Switch):
Connect to Wide Open Throttle Switch. Required for
Peak Recall Functionality.
Blue Wire (Optional Data Logger Signal Output):
Connect to signal input(+) or Engine Management System
or Data Acquisition unit.
Blue/Black Wire (Optional Data Logger Signal Ground):
Connect to signal input(-) on Engine Management system
or Data Acquisition Unit.

Connect the Blue Wire (Optional Data Logger Signal Output):
Connect to signal input(+) to the Analog 1 orange wire 3 on the SCT 1394

Connect the Blue/Black Wire (Optional Data Logger Signal Ground):
Connect to signal input(-) to the Analog 1 GND Blue wire 4 on the SCT 1394

I would also tie the grounds to the chassis ground that you have connected the gauge to along with the GND Black wire 2 on the SCT 1394 GND

Last edited by Paul P; 03-09-2011 at 07:45 AM.
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