Let taste be your ultimate guide, not the quality of the puck. If the coffee tastes great then that is what matters.
Assuming the Sunbeam is maintaining good temperature and you are using fresh beans ideally roasted with the last 2 weeks, you may need to play around with the dose and grind. If the puck is wet and sloppy, your dose may be too low. If the puck is wet on top, your grind may be too fine. No crema could be the result of old or poor quality beans or grind quality. What grinder are you using and how old is it? The burrs may be worn, producing a poor grind
Can't advise on the pressure gauge. Try googling sunbeam 6910 gauge. It might also be time for a new machine? Appliance coffee machines aren't designed to last forever.