During the restoration of my TCS, I had a brain storm
When getting ready to put in the underlay and carpet I thought "what if in the future I need to replace or run a new wire into the engine bay?"
I sure as hell would not pull up all the new underlay and carpet.
I came up with the below. I run a 1/2 in conduit from the engine bay to behind the dash, parallel with the wiring loom.
So glad I did this!
Today I had to run a new wire from the coil to the tachometer, with the conduit in place this took me all of 2 mins!!!
first blew a cotton wool ball through the pipe with string attached - then - used the string to pull through the wire.
No headache - No swearing - No pulling anything apart.
Easy fix and plenty of room for future wires if needed.