New one on me, man. Unless....and this is a BIG unless.....there is something about the switch wiring inside the back of the switch body (since there are only 6 allocated wires when it's used with the TS chip) that connect pins 7-12 with #1.
I've never had the opportunity to try it nor the need.
Anyway, good thing you got it figured out.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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