Now that's what i want (but unfortunately i can't afford), a super fast and smart standalone even if it can't drive the instrument cluster.The only gauge the Holley can run is a tachometer. You'll need stand alone gauges, or need to buy a Holley touch screen display or a race pack.
Be careful with auto tune on the power commanders. It's fine for part throttle stuff, but it's just not fast enough to use all over. The holleys are super fast. There's a lot of stories on the Internet of how Holley efi saved guys motors. Last week I was driving my mustang and the alternator puked out on me. As the battery voltage started dropping off, of course the fuel pressure was dropping off too. The Holley actually increased the injector pulses to compensate for dropping fuel pressure. Made it home, and if it weren't for my (usually extremely loud) fuel pump was very quiet, I wouldn't of know it had an issue. Hooked up the computer and saw the ecu progressively added 8% more fuel to compensate for the falling fuel pressure. Saved my from having to get towed!
I understand what you mean when you say that the PCV is slow and you are right, it won't save the motor from a lean condition at high revs but for the high rpm band i rely on a good dyno tune.
For some reason it was that medium rpm band and especially the "no boost" to "boost" transition band that i had problems with.
Right now my system is messy as it uses the stock ecu, a split second AIC for the plenum injectors, a PCV with boost reference and autotune, a bosch external pump and an aeromotive 1:1 FPR.
I have now understood how the system works but i keep dreaming of a standalone "clean" ECU system.
Chris