Does this thing have the awful, the menacing, the dreadful "seat belt interlock?"
Look under the dash for a relay about the size of the horn relay but with a great big plastic reset button. If so, there should be two yellow/ yellow tracer wires. Pull them out and hook 'em together
Otherwise, identify the "not" NSS wire going to the starter relay. You should have power there "in crank." If not, it's between there and the ign switch, so check the bulkhead connector and check for a seat belt relay
Try grounding the pin of the starter relay which goes to the NSS. You should be able to see which one, IE the wire going from there down behind the engine to the NSS.