Hi Draco
i looked in the coin slot guide and there is no wiring diagram but there are some step by step service instructions.
It can be downloaded here-
http://www.coinslots.com/manuals/evans/As for price, they are not a high dollar collectible machines, at the moment, but they are gaining more acceptance among slot collectors now, so who knows?
complexity and potential fire hazard of old cloth covered wire seem to be major factors in holding the price down.
I would say non worker with peeling/ cracked glass, no more than $250, non worker with good cabinet and glass $500 -$1000, restored or MINT working original $1000- $1500.
Please post a picture, would love to see it!
Nigel