I've just downloaded the AN124 and had a look. It does contain 3 incompatible gauges in the panel folder. If you just delete the "737-400.dll", "Mooney_Bravo.dll" and "KingAir.dll" from the panel folder it should then work, unless you've copied the 32bit FSX gauges into your P3d gauges folder overwriting the 64bit versions already there....