92KK 84WW Olaf
Life time member
Number of posts : 7955
charlie99 wrote:brian if its an early series tank ...with the fuel pump and level sensor connector near the front left hand side , support electronics inside the instruments are required ....the old system uses a 2 level sensor for 7 and 4 litres left , but the new series gauges use a feed from the rear mounted tank connector to integrate a low level switch , supposed to be for 4 litres left , and an analogue wiper (90 ohms ) which would feed a conventional stand alone fuel gauge
you could transfer the electronics board internal from the old instruments to the new instruments ....but is a hell of a job to get it all correct , if inexperienced .
that's the short answer
but I don't see why some clever soul could develop an external level trigger device as an add on for a couple of leds to indicate the low level status of 7 and 4 litres coming out of the old tank connector .
the alternative and probably preferred method would be to get a later series tank with all the gear inside already , extending the cable to the tank rear connector would not be too hard to accomplish , and an additional gauge for fuel level could than be added to the dash - fairing - somewhere
hope that helps
But to put a later series tank on you will need some means of holding it in place. Early ones are bolted down at the rear, under the seat. Later ones have two pins on the underside and the early frame has not receivers for these pins. I have no ideas on the loom connections for the gauge to actually work.
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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
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1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
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Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500