1989 318 TBI ignition questions

I've never worked on those. Does the ECU control timing? Easy to tell does it have a vacuum can? Does the rotor "spring" against a mechanical advance? I bet it's electronic. If so you'll need the TPS. You might have to "dummy" the injectors into the system to fool the ECU, IE pull the injectors out of the TB and connect them electrically, roll em up in a bag or whatever. "You might" be able to sub a couple of appropriate resistors to fool the ECU