Factory ammeter
When crimping wires into terminals, It's very important to make sure you use the correct crimpers. HF one size fits all will cause problems. You need to make sure you're using the correct lugs and dies. Some are insulation grip, some are conductor grip. The knowledgeable guys here know this, I'm trying to help the first timers. I wired 747s and KC46a's for years, for those questioning my knowledge. Use the right wire, terminals, and crimpers. Use a good quality dielectric grease. too.