Hi,
Aftermarket park assist won't make any conflict with BlueSaab as they aren't linked to car's CAN bus. You can go with SID text scrolling without any fear
Saab Park Assist (aka SPA) is a factory option that "talks" to car's bus network.
Enjoy !
01' 9.3 SE Conv - AS3 - Nexus 5 Android M 6.0.1 - BlueSaab v4.2 + Amp - Latest CDC repo.