After inspecting and thinking.. I deduced i am going to cut into the crank speed sensor at the diesel ECM as the wires already run that far so i'll cut and splice in that location,off to the side and away from the engine. I was hesitant to splice into the thin wires running from the crank sensor as the area is very exposed.
I needed to use my car yesterday and again today, so the switch will not be put in until tomorrow, too bad as i will be doing alot of engine On coasting on the
150 mile drive today.