Let us ask sir Jedi, maybe they were able to test it with Opels. Maybe Smartgauge supports those signal protocols(cant verify though, details/support re signals are limited on Smartgauge site) because it has been used since the air regulation standards..Backward compatibility will depend on the transceiver, de-coder used in the Gauge..
BTW im using Scanguage and it does support PWM, VPW, ISO, KWPx, and CANxx
