I'm having an issue with an older Apex. I'm considering upgrading to most likely an EL (I don't care about OPR and Salinity). Neither new unit comes with a display. Will the display from the older units work with the newer units? Will the older EB8s, PM modules, etc still work? I've spent a lot of money on the older stuff, I want to make sure it is still compatible. I love the display module, I still activate my feed modes from the display.