Hi - I have inherited this problem as described by Chumpalot, when I bought his Supra a few months back.
I have had the speedo/odo part of the dash off to check the wiring, and here's a photo:
Now, I noticed a few soldered connections that had dodgy or no insulation at all. This may well be the source of the problem (overdrive lights flshing, speedo needle occasionally having spasms, power steering going light at speed etc.), but can anyone confirm that connecting the pink cable (loom side, that is spliced to the grey/white cable running to the delimiter/converter) and splicing into the blue/red wire (from pin 5) would effectively be the code 42 fix documented above?
I want to check, as no one yet mentioned their speedo/odo converter was wired into the pink pin 6 wire..
Cheers for any advice!