There were some Indian GP diagrams in the back of the 'un-official lambretta workshop manual'.
It was a home printed circulation that carried on from the pink lambretta book, produced by Bedlam in the '90s if I remember correctly.
My 1979 gp has the same switch . If i recall the wire or wires tbat relate to the indicator button have be cut off on mine ( no indicators or battery). if you need me to pop headset top off let me no an il tell you were the others go.
I thought these switches were only used on indicator models ??
What colour wires do you have ??
If I remember green/black to relay
Blue/ black left indicator
Red/ black right indicator
White/black flasher bulb
White horn
Red main beam
Blue high beam
Orange to orange with ignition
They're not, loads of indian import gps have the li type switch and the indicator wires are removed / bodged. it's for a mates scooter and looking at the back of the proper li switch vs the indian one that came off the wires are in different places :-/
Im looking to put the normal li switch in the non indicator gp