I am going to have to switch voltage regulators on my toad when I fit an AGM. The factory ECU voltage regulator is crazy-nuts too high of voltage for an AGM battery that will be subjected to 150+F under-hood temperatures. I am going to do with a remote rheostat (already made up) Transpo 911-02 voltage regulator.
But again, this is for "far-side-of-the-moon" environment. Celsi is going to construct a 13" tray underhood, and the battery is going to be wrapped in 316 grade marine stainless cable so it doesn't spring out of jail and run down the road. It is amazing how well a 12-volt electric fence charger works when isolated atop rubber tires with a stainless braid ground strap connected to the fence charger opposite post. A key FOB 12-volt remote switches the system.