[johnsjmc]

. Some newer engines have a temp/ oil level sensor in the side of the pan and a newer Jeep might have that. You have said temp and pressure so I am guessing you mean your pressure gauge is fluctuating.Your oil pressure gauge wire was probably in the way when the pan was changed.
Like a 911 the gauges are electric and electric gauges are easily affected by a loose wire at the sender.BUT first check the oil level with the dipstick to be sure they remembered to put oil in after changing the pan. (It does happen ).
Then I would suspect the push on connector at the appropriate sensor is loose. If you can,t locate it easily ,then take it back to the garage that did the pan and have them fix it . It should be as easy as pulling the connector off and pinching it slightly with needle nose pliers and then reattaching it. The location of the sender varies by which engine you have so I can,t help you actually locate the sender but I think it,s the most likely cause of swinging gauges on any vehicle. If it has oil in it.
If the garage didn,t disturb the wire when doing the pan then it,s likely just a coincidence that it happened now

Porsche specific content isn,t an issue .