Question about gauges and wiring (1980 kz750 LTD)

Hey
So i have to do all the wiring for the ignition, headlamp, and gauges. For the gauges I have no idea what color goes to what. Would anyone know by any chance? and also what does the 1=1:5 on the back of the tach mean, and m=2.1 on the speedo? also where can i get that same exact bracket? person i bought the bike from only had one -_-
also i do have the wiring diagram for the ignition, is it difficult to have it all wired? i have never done it before...
Thanks!!!

If needed, here's a link to the wiring diagram in KZr's FILEBASE:

www.kzrider.com/filebase/doc_download/293-kz750h1

Good Fortune!

Here's a site w a manual & wiring diagrams. Scroll down & click "The Bible" link. mbsween.bike-night KZ750L3 page
Some of the wiring diagrams are mislabeled in the links. An H2 is an 81 & an H3 is an 82.
search tags mbsween KZ750L3

Are the LTD's and he regular kz's the same wiring?