I took a different approach.
After dealing with wire routing for years, last year I had engine off and updating FWF items like adding a second heat muff inlet for cold winter days.
I added FW penetrations (2)that aligned with the space under the cylinders and above the intake tubes. On the cockpit side, I split the CHT/EGT wiring for left and right and routed them accordingly. FWF side I routed the wires through a flexible sleeve like is used to protect the lead/probe connection. obviously straight shot to cht locations and hooked around tubes to hit egts.
Keeps wiring "inside". Very little need for support. but did tie midspan to something else when complete. I am very happy with less clutter of wires FWF.
RV-6, 0-360 Hartzell C/S, Tip up, 1150+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
Louisa, Virginia KLKU N94TB