Colin i have a Ko-Vfs 2000j at present but will probably be getting a Lrp qc2 to go in the 1/12th unless i find something better to run.

I'm not sure about having to have an unlimited speedo for your set-up but i'd guess so............ with 1/12th scale it seems more important that the speedo is truely 4 cell compatable.

So far mainstream speedo's that are, seem to be :-

Ko
Lrp/Nosram
Novak

There are others but they seem to be the big players