I've heard that the PGM3 can be a bit useless at the best of times (I even once heard it referred to as "broken" lol) and that the IV is way easier to tune, since you just need to get the different cards to change the ignition map.
Change your source of information. Whoever you've been speaking too clearly knows nothing about NSR's, and is probably trying to fleece you out of a wad of cash for something you don't need!
If, IF your PGM-III is indeed dead for some reason, you'd actually be better off with a PGM-II on it than a PGM-IV, although a replacement/repaired PGM-III is the sensible way to go as it doesn't involve a harness change and all the other little odds'n'sods that go with it!
I've updated your poll for you! _________________ Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.