Let me try this again. Wife worried I am spending more money and I can't concentrate with all the logic going in one ear and out the other.
Chuck,
I have installed the Wika Gauge. I did not remove the derlin washer. In fact, I securely snugged it in place and it lined up perfectly. However, It did require some sanding as it was s too tight and I could not turn the dust cover for alignment with the fill port. It now works very smoothly. I have removed the air cylinder and the FX Air Regulator. I am concerned as this regulator is completely different from the regulators shown or that I have observed in various tutorials. This FX Regulator is 48.24 mm in length and the adjustment screw and washers are not visible. I had to use a 5 mm Allen key to twist it out. Further, it appears to be externally adjustable by means of a Allen key. The vent ports are 68.46 mm from the end of the cylinder. I am thinking this is an AMP Regulator as described by "Straight Shooters" as follows: "The AMP's advanced design allows for precision tuning that can be dialed in to a more exact pressure measurement without the spring fatigue or pressure creep that plague lesser regulators. Plus, the AMP allows you to increase and decrease regulator pressure while the Wildcat is fully pressurized. Gone are the days of needing to de-pressurize your rifle before lowering the regulator pressure. This allows the AMP Reg to be externally adjusted within the fixed 300cc aluminum air reservoir using a simple Allen key".
I am keeping my fingers crossed as to whether or not the HUMA will fit. I ordered my .25 compact on 11/21/18 and did not receive it until 12/14/18. Since FX included the AMP Regulator on the .30 Compact, I wonder if they have upgraded the .25 Compact as well. Chuck, you recently tuned a War Cat .25 Compact for your friend from Palm Beach Air Guns. I assume it had the old regulator. Any way, I hope the Huma slides in with no hassles. On the other hand, if this is an AMP Regulator, I can make adjustments without adjusting HS. This regulator certainly looks more robust than the old FX Regulators. Clearly, this presents some what of a dilemma. Your's and other members input would very much be appreciated.
TX,
NJO