Finally got around to finishing up my diverter installation. I ended up going the diverter route (summit) instead of the a true third function. I bought the diverter and quick attach from Summit. I bought the adapters/connectors from my local parker store. I bought the push button switch, toggle switch, and hoses from Amazon.
I decided to mount the diverter on the quick discount bracket because I thought it was a cleaner install; however, I have to admit that it's a pretty tight fit. I can see what people mount their diverters on the FEL itself. I started off with a wood template to get the location of the diverter correct.
I also decided that I wanted to have a switch to turn the diverter on and off separate from the push button. After you remove the three bolts you can add a switch to one of the empty slots. One of the wires has 12v when the ignition is on, so you can tap into that power for the diverter.

I then took off the ergo handle on the hydro and drill out a small hole for the push button. The ergo handle is held together by a couple of screws and I ended up drilling through one of the holes for the button. I was a little afraid I would have to glue it back together, but it works great. Honestly, better than I expected. There's no slop in the fit.
Removing the cover for the hydro arm is pretty straight forward. I originally wanted to run the wires through the rubber boot, but decided it was too much work.
I lived with the wooden bracket for a couple of months until I could get a metal bracket fabricated. I finally got some scrap steel and then used my wooden bracket as a template for the steel.


Here's the complete installed assembly on the tractor. It's tight, but works nicely and has a clean look.

Right now the front hoses are loose, but I'm planning on fabing a mounting bracket for them as well. Does anybody know the bolt type for those two mounting holes on the front of the FEL?