[jriebe]

i have those tabs on a 3500 Sovran.
was having problems with them responding--sometimes working and then they'd not respond.
i replaced the 'brain' 5 years ago and everything has been fine.
what i call the brain is screw in the bilge far back on the transom on my vessel. i traced the wiring from either side at the actual interceptor through hull places.  the wires lead back to a central black connection manifold where each side interceptor plugs in and the controls from the helm route back and also plug in.
i order a new one and replaced the old.  plugged everything back in and it works

the tabs do tend to under compensate for leveling.  i can't really put the bow down at slower planing speeds and with even crew/guests and wrong wind i have to max it out to maintain level.