i just recently got a 98 gt with the 4.6 and i want to do the white face gauges, but i dont want to do the over lays.. i was thinking of getting a cluster out of a cobra. the reason im confused is cause the one in my car is a 150mph and the cobra is 160mph. could i just swap clusters or do i need to change anything else so that the spedo would work correctly. any help would be great. thanks