I just put this on the NC, but it is obviously universal.
AEM released it this fall. This is different then their old gauge. I just finished installing it and basically it will tell you not only if you have a blockage, but if there's a leak as well. Connects via USB, switchable gauge faces (before you chose the 500 or 1000cc versions), built in datalogger etc etc...
Colors are custimizeable via software/usb cable
Installed. Not symmetrical because I'll be moving the wideband on the left later.
You set both upper and lower limits for the alarm. If the upper limit is exceeded you have a leak--if the lower is then it is a blockage. Since the sensor is right by the nozzle it is a true indication of flow.
The reason its a failsafe and not just a gauge is the fact that it has two outputs that could be used to either trigger a solenoid to bypass the boost controller and reduce boost, or connect to a piggyback/EMS to switch maps. Basically you don't have to worry about your meth/water failing and grenading your motor, since it will automatically retard timing or kill boost before damage occurs if wired in that way.
After playing with it for a while I was able to set it up so I had 150 cc of flow at low boost, 300 at high boost, and max at 400 in case I boost creep. Before I was spraying blindly basically 400 from 5 psi ON. So in that sense I gained a few HP from a more optimal flow progression.