1 pointIt’s worse than that. speed and size shape of the bag if wrong will snap your neck. The millisecond timing and impact threshold is built in to the controller to match the airbag and explosive, newer bags can inflate at a different speed. there are places that will restore them really well. Most are home based businesses so can be hard to find.
1 pointhttps://www.summitracing.com/parts/avm-30-2212 it has can bus expansion so pretty much unlimited options to add more sensors. there are cheaper units with 4-8 inputs as well.