The airlift suspension is perfect for your needs! I still have them in a box with my stock suspension. The piping is still on my car, you can drill a hole through right above the license plate to place your psi gauge.
Check out my garage page to get a feel of where to place them. http://mirageforum.com/forum/showthr...e-entry)/page2
If you need better pics I can go out and take some for the piping, however I have coilovers now.
This is the model i bought. https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
Edit: I kept my psi around 15 and it was great. The airbags won't lose tire pressure like tires do, but they might lose some every time you use a psi gauge.