76 dash in a 74 Dart?

I didn't order any lamp sockets. I was planning on using the ones from the bad circuit board, not knowing it was a 76 circuit board and the sockets were different from that year.
I understand. 76 was very different
I don't think the harness was changed, but I could be wrong. This car was under restoration since 1984. From the problems I've had with the engine timing (40 degrees!!!) and the wrong transmission (from a early 60's), I have no confidence in anything the previous owner may or may not have done. question is, did he pop in a dash cluster from a 76 and leave the 74 harness or did he change the harness to a 76 too? I don't know how to tell the difference, and I can't contact him to find out.
74 dash harness would have 2 very heavy gauge wires ( a red and a black ) attached directly onto the amp gauge. 76 has remote shunt design. So small copper traces attach that amp gauge just like the other gauges. Those copper traces cannot carry the full current so if installer did simply put those 2 large wires of a 74 harness in the round connector, that would explain fried traces to amp gauge.