Good news and bad news...
The good news first - Western Gun is fully working!
The bad news - I had to use a LCD monitor (gasp!). Ok, ok - ease up the grip on those pitchforks. Chad Entringer serviced the chassis of the original monitor and had it working on his test bench (with a different tube). When I tried it with the original tube I get nothing, which leads me to believe the tube is dead. I've been looking for months now for a 19" black and white tv that I could retrofit (or even do a tube swap) but I've been unable to locate one locally. I'm at a point where I'm going to sell the game, so I decided to throw in a LCD with a composite input just to have a playable game to list for sale. I'll be including the original monitor in the hopes that whomever gets it will eventually get the CRT working and re-installed.