At some point in my project I will be installing some form of aftermarket fuel injection and relays for the headlights/ignition so the headlight current does not pass through the switch. Rather than trying to adapt my original wiring I was thinking about removing/preserving the original harness and building a new one. Has anyone removed their engine bay harness intact?

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT