ok i just got the greddy profec b spec 2. it says that it has real time boost display. i was wondering if i install that would i still need a boost gauge? i plan on getting a boost gauge anyways but i have heard that the greddy ebc's boost gauge isnt accurate at all and that i need a normal boost gauge immediatly. so can i use the ebc's boost gauge for a while? or do i need a norlam one now?