New bike to me

[Normk]

I found a 1977 GL1000. the idea is for a winter project. When I went to look at it I found a lot of interesting things. First the wheels, Mag wheels, not spooks but the front is the proper 6 bolt wheel with the thicker brake rotors and stock forks. Not a Lester wheel. Back wheel is a matching wheel but 16 inch not 17. Air shocks and best of all, a single carb conversion with a manifold which appears to be cast. Bike had a new AGM battery and after a bit of fooling around it started. Came with a very nice seat not stock and brand new clip on bars. The one thing I can't explain is a sending unit installed just below the oil filler opening. Had a single wire attached which ended up buy the headlight attached to nothing. I don't know exactly what to do with this bike. I would like to return to as stock as I can. Not many of these left. All for $500. In the same area I found a very complete 1978 GL1000 with a stuck motor for $150. It has a new stock seat and very clean exhaust and stock handlebars. Any ideas where these wheels came from and that sending unit? Front end of the bike has been lowered by sliding the forks up by almost 2 inches. My question is, would it be ok to leave it lowered about an inch because of the smaller rear wheel? I have read so much about messing around with the forks and rear suspension. I just want it safe when its finished.

[Track T 2411]

The wheels certainly look like Lesters to me. The 16 inch rear rim is pretty commonly used without any mods to stock ride height, but there are lots of various opinions out there.
Just an FYI, there were several changes between 77 and 78 model years.