That LCD unit is developed by a German guy, and it may be good replacement for the broken OEM units which are hard to find and very expensive.Thanks for that info. Thinking about putting a volt meter in that spot, since I need to replace some dash lights anyway. Now, if I can disassemble the dash without destroying it, I was thinking of putting this in the OD spot. I have to admit though, I like the concept of this display (https://www.youtube.com/watch?v=ENXz6fsfI08) and it's features, however, I would be happy of the just gear indicator could just be added to the current display.
It will fit all GL1500s (some models do not have 2nd gear signal as you know) because it does not use any gear signals, instead it uses speedometer and rpm signals to calculate the gear.
However, one feature that I don't like about it is, it will not show any number while stopping. So you will have to find N first and then put the gear in 1 etc.
On my solution, you will see the gear in any case, and since I have used the voltage of the ECU input, it is very useful to understand the kill switch position (I am sure many of us tried to start the bike when the kill switch is off).