actually the LS1M registers 14.39psi :-p
but yes you're correct. i dont know how to setup a 3 bar map sensor to the pcm but its kewl. i bought a boost gauge on ebay that has hi/lo peak warning as well as recall that has its own map sensor. its a marshall instruments scx pro street 2 or whatever. going to install it soon. want to be able to run 16-17psi daily if i can.