[BR3W CITY]

What fuel sending unit is this running Cline? On a P59 If you go to the Fuel System section and take a look at the "General" section (might be the only section). It should have "Fuel Tank/Guage" and then a series of boxes.

GM expects a ~240ohm sender range for the late models, so if your tank volume is different than what it expects, the sender isn't hitting its voltage@resistances where the ECM thinks. The Camaro tank would have a different default tank volume vs a truck if you started from the truck base tune.

The Service Vehicle light is probably being thrown by a false reporting DTC. Take a look at your master DTC list in the engine diagnostic tab, see how of the MIL/Services codes are set. You may need to change one to "not report"

I'll look over more tomorrow, im sleepy now.