1997 Sportsman 500 gear selector switch issues?

I’m a long-time follower, first time poster so here it goes. My ’97 is in tip top shape buy yesterday, when I shifted into reverse and then into Low, the reverse light stayed on and the rev limiter kicked in…in all gears, high and low, I also noticed that my low beams are not working. I suspect this to be either a gear selector switch, or a R/W wire issue so I backtracked the wires to the board under the light. Everything was connected from what I see but when I disconnected a R/W coming from the harness, the R indicator light went off (as did the other gear indicator lights, AWD light (AWD works) minus the over heat indicator – that works) and ran as normal. I did notice that the low beams still did not work when the R/W was hooked back up so that could be the light switch itself being finicky. Could this rev limiter in all gears be a fuse, a connection issue or a failing gear selector switch that jacks-up everything else attached in the R/W board? If a switch, where can I find an aftermarket for a ’97? I’d like to have this back to 100% operational working order for a future sale but afraid to dig around a bunch of wires that may break due to age making things worse.
Many thanks