Was the problem ever trouble shot? You state " It saw RPM for a while and then just stopped" Who built the MS unit? Do you or the person doing the install/tuning understand M/S and it's operation? Did you ask for help with diagnostics here?
http://www.msefi.com/
The megasquirt is a viable stand alone for someone that is capable of it's operation.There are people on NICO that are using the MS on CA18's, RB's are no differant with the exception of 2 more cylinders. MS could care less how many injectors it runs or the # of cylinders.
zerothread?id=276966A qoute by Boost_boy:"If you're prepared for that kind of expansion, go for it. The use of a standalone engine management allows you to be extremely flexible in the type of performance most of you expect from your engines. Again, if you're prepared to do the leg-work to get one installed, it would probably turn out to be a good investment. But as with any engine management, with an inexperienced tuner behind the controls, disaster is just a bad program away from happening. Good luck at whatever route you take......... Deeend qoute"
A link to the write uphttp://forums.nicoclub.com/zerothread?id=164446
Bottom line do your research and don't jump headlong into any type of engine management, it will turn out to be a headache.