To the OP's original question- nothing personal but why would you want an idiot light on a bike that already has a fuel gauge? If you're not going to trust the gauge, are you going to put more trust in a silly light?
Or am I reading the question wrong?
I want an idiot light on this bike because it has an idiot fuel gauge. No, I just wanted to know if it had one, like my CX650 Turbo. Better to ask beforehand, than to assume it has one out on the road.
My worst gas mileage was also in West Texas. Head wind, combined with two closed gas stations. My pillion and I pushed the bike the last 1/4 mile to the next gas station after we ran out. She was pushing. Just as I was huffing and chuffing, trying to get my overloaded bike up the incline, I yelled back at her to don't give up, we are almost there. When I pushed it up to the pump, I turned around to find her 50 feet behind. ***? There are several pictures of that overloaded bike in the "No Comment" section of Motorcycle Consumer news back in the early '90's. It was a CX500D.
Then on another trip through west Texas, I planned to get gas at a place I had gotten gas on a previous trip. But it was closed. For good. A lot of gas stations that were once there ten or fifteen years earlier, are gone. I didn't have enough gas to go back. So I went to the next intersection, which in Texas is never less than 50 miles. Not knowing the area, or how far it was to Wherever, I approached a sole car parked on the side. The occupant was dead asleep. So, according to my map, I could go north 15 miles, opposite the direction I wanted to go, to get gas, then 15 miles back to where I was. Or, I could continue south in the direction I wanted to go, 90 miles or so to the next gas. I had developed a sense for how many miles I could go after hitting reserve, factoring in head winds, grades, etc. I did a mental calculation of, "If I hit reserve before this many many miles south, I have to turn back and go north. Well, I hit that mileage early. So I turned around and went back to the intersection. The driver was awake. "Oh, no.", he said. "They next gas north is 30 miles." Fudge. I could not make that. So I began to backtrack west to the only town I could maybe reach, which had no gas station, but at least it had people. On the way, I approached a road construction crew that was not there earlier. It's funny how a couple pieces of heavy equipment and a few guys can look like an oasis. I explained my dilemma, and he radioed to one of the guys in the field, who brought over in his bulldozer scoop a five gallon jug of gas. They refused payment, maybe because the taxpayers already paid for it.
Then there's the time I ran out of gas in Death Valley, but that's another story ...