Use the '94/'95 P72. Don't use the newer (OBD2) P72.

Are you sure the injectors are spraying or just the fuel pump running? The injectors aren't supposed to spray until the starter is cranking.

Since he cut & spliced the harness, you might have to verify EACH WIRE is at the right terminal at the ECU. PITA!! Maybe you can check what he did right where he cut it. It should be put back together with the same color wires attached to each color. No mis-matching where it's spliced.

I don't have the books & stuff for my '95 GSR any more, but I recall that the GSR stuff was add-on. All the LS wires go to the same terminals on a GSR. So all he should have done was ADD wires into empty slots in the ECU plug of the LS harness. I don't have a wiring drawing, but I might have some notes about pin #s for '95 Integra (have to look for it tonight).