Can't offer you a Digiplex but can offer you some advice to make it entirely reliable! When you get a replacement ignition unit, change the Paso ignition coils for a Kawaski module. I have changed mine to Kawasaki GPZ500s coils. The standard coils have a very low impedance causing failure of the Digiplex unit, my standard coils measure 0R8 ohms! The GPZ500s coils show a more reasonable 3R5 ohms and are readily changed over because the HT lead is retained by a screw in collar but you have to double up the positive supply to the coils. You can see the Kawasaki coil behind the radiators within this picture (if the link works).
