Really no reason you can't have both, just can't use both at the same time. If you have room maybe keep the Guest as a backup.
Promariner chargers are great, if you got the model that's made for permeant mount it is going to be far superior than the original Guest charger. What model did you get? Some are made for powering while charging, meaning it does a great job keeping up with power demand of your 12 volt systems while in use(fridge, lights...). It also does a great job on maintaining charge once it's topped off. Follow the instructions carefully. The wiring is very important for voltage sensing and not over charging. I installed one a few years ago and was pretty easy.
_________________ --2002 3880 Regal Flybridge | Twin Merc 8.1HO **Seven** --2003 AB 13 VST Console Inflatable | Tohatsu 40hp TLDI **Phish'n ski** --310 Mercury Inflatable | 1982 9.9 Johnson
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