1966 C10 3 speed OD

looking for someone with a 1960 - 1966 C10 with factory 3 (on the tree) speed overdrive. ( The Muncie 319 trans with the R10H-1 Warner OD unit)
I am doing a retrofit on my 1966. I would like the location of the cable OD handle, Relay, Throttle switch and wire harness to match the factory setup. Unfortunately wiring diagrams and information for the C10 is scarce. ( I have all the assembly manuals and service books, but no mention of OD in them) My 1966 owners manual has a section on how to operate it and how it works, but not enough info for an installation. Thanks for the help. Nitro