only to get it thru the firewall. Haven't heard of anyone removing the dash. Good luck and report back your experience. I'm next in line b/c I'm replacing my injectors and pulling the plenum. So now is the time I am going to replace my harness as well. Here's a post from 300zxclub.com, hope it helps. [ http://www.300zxclub.com/showthread.php?t=104069&highlight=efi+harness+install ]