Gauge Cluster Conversion - Truck Now Dies - Help!!

[1972BlueC20]

So i did my conversion from an idiot light dash to a full cluster dash with tachometer, I followed all the instructions online and with help from people on this forum.

All my gauges are working but I'm having an issue with my truck dying when I drive it. It will idle all day and even rev in park, but once I start driving it will die at different times.

Thought I had a loose wire going to the HEI, so I made sure it was solid, still dying when I try to drive the truck. I didn't mess with the wire going to the HEI during the conversion other than I probably bumped a lot of stuff back there while installing the copper line for the oil pressure. I know it's a problem with spark because the first time it died, I took # 1 spark plug wire off the spark plug and had no spark....I then wiggled the wire feeding 12v to the HEI while my wife turned the key and it eventually started back up. Since then I have used the proper HEI harness plug end that I spliced into the 10 gauge wire going from the bulkhead to HEI (original resistor wire was replaced with a 10 gauge wire) It had worked for over a year no problems until I did this cluster conversion.

Is there anything that could of caused this related to the gauge conversion?

Any help is greatly appreciated!