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Installing the Futaba GV-1 Governor in a GPH346 / Enya 50 / Futaba 8UAPS
Settings for the T12ZH radio

Removed the engine from the heli.

The GV-1 comes with one sensor mounting bracket for a 30 sized engine and one bracket for a 60 sized engine. You guessed right, neither fits a 50. The 60 sized bracket was closer to fitting than the 30. I just had to drill an extra hole for mounting to the engine mount screws and I had to grind down a couple of areas for clearance where the engine interfered. The extra 'original' hole is being used for a zip-tie mount to route the sensor wire.

I did not need to remove the flywheel or fan assembly from the engine because the GPH346 fan already had an area for mounting the sensor magnet. No drilling was required. I mixed up some 30 minute epoxy and glued that sucker in. *Note* Polarity does matter. You can install the magnet upside-down and the Governor will not function. Before installing the magnet, I tested the sensor with the GV-1 and colored the correct side of the magnet with a black "Sharpie" pen.

I mounted the sensor to the sensor mounting bracket and made sure it would not touch the fan while it was spinning. The clearance here is 1~2 mm. This is REALLY close! To test, I connected the sensor to the GV-1 main unit and tested the sensor percentage. 60% is acceptable, 97% is maximum, I got 97% :)

The fan shroud on the GPH346 wraps under the fan and interferes with the sensor. I trimmed the under part of my fan shroud to make clearance for the sensor. The sensor itself fills this cut out area quite well so I shouldn't see any loss of cooling efficiency.

I mounted the GV-1 "amp" (the digital display) on the backside of my elevator servo near the collective linkage and near my receiver. No extensions are required to reach the receiver. I didn't have an area clear of the canopy that I liked to view the display. I'm thinking of someday mounting the amp (display) on the side of my fuel tank and using servo extensions to reach the receiver. This area would allow easier access to the display panel and functions but would be a lot more exposed during a crash.

Setting up the Futaba 8UAPS radio was easier than I thought it would be. Under GOVrpm I set Norm to 0%, Idle1 to 50%, Idle2 to 100% and set it to respond from my Idle-up switch (G). I couldn't find any helpful instructions on how to turn the Gov on and off from a switch so I made this part up. I set one of my two available pmix's to Ch8-Ch8, +100% -100% activated on Switch D(Aileron Dual Rate). Also, to free up switch D from the D/R function I had to program my other pmix to AIL-AIL, -75% -75% activated on Switch A (Elevator Dual Rate). This puts all cyclic D/R on one switch.

Programming the GV-1 amp was also quite easy. The first time the unit is powered up it looks for you to set the limits of the throttle servo. 
Idle - put the throttle stick at idle and hit the data+ button on the amp. 
High - put the throttle stick at full throttle/collective and hit the data+ button on the amp.
Stop - put the throttle stick at idle, pull the throttle kill switch and hit the data+ button on the amp.

Next I verified the speed settings for the three modes.  To switch between the modes, flip the Idle-up switch.
S1 - was defaulted to 1299, I made it a nice even 1300.
S2 - was defaulted to 1498, I made it a nice even 1500.
S3 - was defaulted to 1699, I made it a nice even 1700.

For the rest of the settings I just cycled through the menu and verified each.  This table shows my GV-1 configuration.  So far my settings are all defaults but then again I haven't flown it yet.  I'm sure I'll be turning up that S1 to 1400 or so.