Just fdpm... Harness is more. I have all the wiring info to build one including pin and wire runs (lengths). Only problem is we have been looking where to find the damn connector for the fdpm.. That's the hard part a it is not listed anywhere I have seen.
Same here I have built a few harnesses but cant find the gt500 6 pin fuel hat connector anywhere either.
I now make custom terminal on the hat for my dual pump/fpdm stage 2 fuel system instead.