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Interesting... The small valve with the 1/4” lines(all the way to the right?) is for the fan clutch control. It should energize with the main switch turned on and de-energize(and vent air) when y0u turn the main switch off...

In the cannon plug that connects to the CTIS controller, Lower case a and capital N are the pins used by the J1587 buss. Capital G and X are used by the j1939 buss.

I don’t think the ground wire makes any difference in operation, I believe it was done to meet some EMI/shielding specification, since they didn’t tie the CTIS case to ground in the cannon plug. Just like they put EMI filters on the wiper, washer and heater blower motor circuits... In the A1...

I would not be the one to be able to tell you that...

It could be that it is doing something to the J1587 data buss. I am assuming that your truck uses the integrated gauge controller, because that is about the only way I could see your CTIS effecting oil pressure, who's information is also passed on the J1587 buss in vehicles using the integrated...