I think it's a perfect application for an Uno even if all you do is light LED's at different pressure levels. Start there and add one additional function at a time. You'll have what you envision in short order.
Start by simulating the pressure transducer with a single turn potentiometer. Use Serial.print commands to print the "pressure" to the serial window once a second. Once you have that, it's a simple matter of adding the lights, the siren/alarm and the limit solenoid.
If you get stuck, just post your code (all of it, not just snippets) using code tags (the </> icon) in the project guidance section and explain what works and what doesn't. Yeah, you might get some people that run away with their hair on fire about the safety aspects but then not everybody understands cranes and heavy industry. It's obvious you do and most importantly, you have a vision of what you want to do. You'll get there and you'll likely have some fun along the way.
BTW, if you want a digital gauge, the easiest and best place to start with that would be one of the character mode 1602 LCD's. Add the I2C interface board that solders/plugs onto the LCD. Get some "DuPont" jumper wires, a solderless breadboard and you're on your way. eBay is by far the cheapest source for these things and if you need some guidance, just ask.