I just tapped in th the light that illuminates the rear defog switch on my 86
I controls all my extra gauge lights, though the A-pillar gauges have their own dimming reostat as you can see in the pic of the trans temp gauge;
I couldn't see the diagrams well either so I took the Haynes manual down to Staples
then I blew each of the 5 pages up until each took up a whole 11" X 17" sheet. Took it home, whited out everything that didn't apply to my specific Bronco then photocopied them back to back (except the 5th page) on 11" X 17" sheets.
After that I plasticized them and now they reside in the pockets on the back of my bucket seats. I don't leave the county without them and my spare Haynes.
I was going to colour code the diagrams until I snapped out of it and tried to regain some kind of life !!!!!!!!
Sixlitre