As the long timers on the forum say....welcome aboard!!!
I am new to maxum & boat ownership as well but Iíve been around them all my life so Iíll give it a go and Iím sure someone will correct my errors...
Maxum was owned by Brunswick but was discontinued so new factory replacements are tough to find but you will likely find a good upholstery shop isnít overly expensive to make you a new seat/sun-pad
You should be able to test the volt gauge with a multimeter or just replace it and see, the gauges are made by faria and so far my opinion of them is like most boats and the gauges are junk. I found several times it is just corrosion on the grounding side of the gauge connection, does not take much and they quit.
The radio, if it has a faceplate, could just need the contacts cleaned between the head unit and faceplate.
I wouldnít run the boat with a chip or any dings in the prop as it creates vibration and cavitation. The prop should be stamped with the size & pitch somewhere on the main body usually at the base of one of the blades, otherwise use the quicksilver prop calculator, just give it a google and itíll have a recommendation.
Did you have the boat surveyed? If not I would recommend changing the raw water impeller in the outdrive (every 2 years)and having the u-joint, shift cable and exhaust bellows replaced (I plan on doing mine every 3-4 in freshwater) also I would recommend at least inspecting the exhaust manifolds, risers and elbows especially if run in salt water as they can leak and can cause the motor to ingest water and hydro lock. I am doing all of this to my boat and itís not cheap but good insurance and peace of mind, ours is 18 years old but only had 100hrs on it so none of this had ever been done.
And enjoy the heck out of it of course!!!!
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2000, 2100SR 5.7 Alpha 1 Gen 2