Welcome to the forum
You can run standard internals just fine on low boost. 10-14psi isn't low boost though. What you're describing (long periods of on boost - motorway hard driving - is the worst thing you can do for any boosted car, let alone one with standard pistons. So no is really my answer, don't do it. You can drive on the motorway off boost of course - just don't keep it nailed
You'll be much better off getting some forged pistons (don't worry about rods) and then you'll be more confident too.
Regarding gauges - boost is good to have but most importantly is a way to monitor water and oil temps. You haven't said if you have an oil cooler or not? I monitor a lot of things on my car but I'm a geek - really oil pressure, oil and water temp, and boost are the most important.
Anything else just ask - we're a nice bunch here. Mostly - if you avoid moke