I'm working on a 93 FD with a LS swap. The Front and Dash harnesses had been completely cut and removed from the chassis by the previous owner, so I don't have a reference of where certain wires are routed with the factory setup.
I have connector X-14 behind the AC housing and the EM Emissions harness. However it looks like the Emissions harness would go from Dash to a section on the engine harness, which I do not have since the LS runs on Holley Terminator.
The reverse switch wires come off of the Emissions harness?

My main question is where do the Reverse wires pass through the body to the transmission reverse switch?

 

they are part of the main engine/emission harness, that passes thru the firewall in the passenger's footwell.

 

Awesome, thanks!