Tim, Sorry I didn’t get back to you sooner. I tried to follow the routing of the original vacuum line. In fact on the outside of the body tub I ran the wiring loom inside some vacuum tubing. The wiring exits a grommet on the outside of the body under driver’s side dash. Enough slack is left to allow lowering windscreen. Wiring loom was wrapped in period correct fiber electrical tape and routed along top edge of windscreen frame. It looks really good even though it wasn’t routed inside windscreen tube. Good luck.