Today I also did some wiring for the fuel quantity indication system. I crimped a terminal to a wire and attached it to the outboard capacitance plate. For the inboard side I soldered a wire to a BNC bulkhead connector, both are shown in image 1. Then I cut out the hole for the tank access panel in the tank inboard bulkhead and match drilled the access panel and retainer ring with the tank inboard bulkhead, see image 2.
