I'll do some-
1. You can probably have a gauge in any units you can afford, I've always seen inches of Hg.
2. I've never seen a separate gauge for the boost pressure (985s, 1820s, 1830s, 2800s.) All you are worried about is MAP, not how you got there.
3. I'd say by balancing it (but I'm not an A&P.)
4. Manifold pressure
5. Increase in what? Prop governor is holding the rpm, MAP drops about an inch per 1000 feet.
6.Are you talking about an engine that is boosted just enough to get back to sea level performance at a higher elevation? (I've heard the term "turbo-normalized" but never "super-normalized.) If you push the throttles full forward the carb is going to be wide open. But if you've got any sort of supercharger, I'd think you'd have enough boost to overboost the engine at sea level. So you wouldn't be going full forward with the throttles.