That would work but it requires instilation. Run wires for lights and run a tube for vacuum.
Actron CP7802 Vacuum and Fuel Pressure Tester Kit:Amazon:Automotive
I have a couple of these. Just hook up for diagnose.
How To: Read vacuum gauges (Vacuum Gauges for Dummies) - Mazda3 Forums : The #1 Mazda 3 Forum
You can learn a lot. Quit throwing stuff and hoping figure out what is wrong troubleshoot.