I placed the ammeter shunt on the firewall with AN4 bolts. AN960-416 washers were placed on the bolt heads, but the bolt shanks still have a lot of play. Nuts were temporarily placed on the cockpit side.
The engine wires for the right cylinders were bundled together and clamped together in an Adel clamp screwed into the bottom screw on the #3 cylinder. This screw needs to be tightened.