The oil pressure gauge is real, though heavily dampened like most modern gauges.
The oil temperature gauge a lot of us have swapped to from the GT350 (or the one built into the cluster) is indeed inferred.
The only option I'd consider would be the OEM Ford tails that were recently released
https://accessories.ford.com/products/mustang-2018-2022-ford-performance-clear-tail-lamp-kit
https://www.lethalperformance.com/ford-performance-clear-taillamp-kit-2018-2022-mustang-m-13504-mc.html
I very much doubt they are remotely accessing the car through the cell connection. Safelite probably connects a device to the OBD port for remote programming.