I got tired of seeing people showing their new monitor, but no one showed how they did it. most said it was a simple drop in, but I didn't find that the case, and wanted to make sure that my monitor was secured. I have attached a pdf i created showing the steps I did to install a new monitor in the ALP. There is a little modding to be done, which made me nervous, but it was actually quite simple. I hope you find this useful and feel free to share it. If I missed anything, please feel free to comment and I will do my best to fill in anything missing. Enjoy.
EDIT *Doing this will make ALL original ALP tables inaccessible. You WILL NOT be able to play the tables that came preinstalled or purchased with the unit.*
You will also need the VIBS board and blindly remember how to access VIBS to use backglass unless you replace the backbox with something like this from BuyStuffArcades which make a huge difference in the game and well worth the price. I also used the Controller Board from VirtualPin which works great for me, and don't forget solenoids from clevelandsoftwaredesign. Night and Day difference IMO.