Be careful with the injector wiring.    The auxiliary air regulator is wired
in parallel with the injectors and the connection is hidden inside the loom
on the '84 digijet model.
You may be getting a wrong reading because of that.
I had a lot of trouble with that circuit and I ended up wiring the Aux Air
reg separately.
Mine went to ground when it heated up and shorted out the hot wires going to
the injectors so no fuel = no run!!

This may not be your problem but it may be something else to eliminate.

Good luck
Steve Cotsford