To conclude, I finally fitted the correct ABS tone ring and the ABS system (from a 2008 1400GTR or ZX14) functions as it should, this is on a 1992 Kawasaki 1000GTR (Concours10, ZG 1000). The only issue was getting the LED to operate correctly. I found that the LED works in reverse order than it does on the donor bike (due to being linked to the bike's ECU via the instrument cluster) ie when reading fault codes I had to count blanks between blinks (flashes) of the LED. Also, when ign is switched on, the LED was off but after riding the few metres for the system/fault check the LED came on and stayed on indicating no faults. This was confirmed by testing the activating the ABS both front and rear. which was functioning correctly. To correct the warning LED issue I fitted a 680ohm resistor to 12v ign feed, the other end to the black/white signal wire to the ABS unit PLUS the +ve LED wire, then the -ve LED wire to earth. One very minor issue remains; the LED has a faint glow after the system/fault check, which is barely visible in daylight.