If the wiring or amal connector is old/faulty and causing intermittent (spelling?) problems you will notice it by the pretty violent cut outs.

For example if its boosting 16psi and the amal valve shuts off it will go back to the preload set boost instantly and that aint so pleasant. On my cossie it felt like a brick wall. Seems strange they says this because of the boost fading. If you swith the amal valve off it will drop rapidly.