Stan
Life time member
Number of posts : 2110
I think you have an early bike, maybe 83 to 86. There is a black plastic hex nut under the left front of your tank that houses the sender unit. Basically the unit is a long cylinder with wiring at two levels, 7 litre and 4 litre which operates the lights.The reason there was a change was that this system was not reliable and I remember my 7 litre light coming on after a few turns coming out of the fuel station.
I would suggest that you use your trip meter as a guide. Fill up the tank and see how far you can go untill your 4 litre light comes on. That way you have some idea of fuel economy etc. Do not rely on the lights. My son ran out of fuel on my bike with no lights working at all and I copped the blame for that one. If all else fails use your digital fuel gauge...open tank, stick digit in, look at digit, shut tank. Do not lick digit to clean. Good luck.
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1983 K100 basic vin 0003960 colour red GONE
1987 K100RT vin 0094685 colour, orange peel, sorry, pearl..GONE
F800R black