psi airtank will hold?

Anyone know the psi a 7 gallon air tank can hold?Im at 150psi and i need more,im thinkin of going to 200 or more,my pressure switch kicks on at 110 and it only gets the car 3 or so inches off the ground so im going to get one that cuts on a 150 and off at atleast 200.(i will be doing compressed air soon but i need for now)