SeaRay;
What model tracker do you have? I have a 04 PT175, and gained access to the underside of the forward portion of the bow where the TM mounts by removing all the screws that hold the sloped panel on where my TM plugged into the power socket and the tilt switch. This panel slopes from the main deck up to the forward hull deck. You should take the smaller panel that holds the TM plug out of the larger floor panel and disconnect all the electrical connections as well. It's just easier that way. The screws are buried/hidden in the carpeting, so just start looking. It will be about 8 screws total, 4 across the top right where the carpet meets the hull and 4 across the bottom side where it meets the main forward deck.
Might as well clear all the other stuff out of the way as you will need to lay down on the forward deck to be able to see up in there and get your arms/hands in there as well. Pm me if ya got ??'s.
BC;
You're gonna need some screws that will be large enough to handle the stress of the TM tugging on the boat, some fender washers, lock washers and get some Nylock nuts, these won't back off, so once you get things snugged down, they will stay snug/tight. MK customer service might be able to tell you what size is suggested/recommended, or whatever size will fit in the base of the TM. You can probably use the plug off your current MG TM if you want, or just buy a new one just like your current one at a marine dealer. Get some good butt connectors and heat shrink wrap to cover all the connections made. Should probably use SS to avoid corrosion.
I mounted my Terrova directly to the hull, so can't help with the quick release brackets. The base of the MK TM will stick out past the bow, so make sure you place it where you can still launch/load your boat w/o damaging anything. It's something you have to get used to.
GO BIG ORANGE !
I meant to behave, but there were just way too many other options available at the time.