MY SPEEDO DOESN'T WORK BECAUSE A FRIEND SHORTED OUT MY DASH AND THE SPEEDO STOPPED WORKING.THE OTHER GAUGES WORK,BUT I WAS WONDERING HOW FAST AM I GOING AT 3000 RPM ON THE HIGHWAY WITH STOCK TIRES AND GEARS?MY OTHER QUESTION IS DO I HAVE TO CHANGE THE WHOLE CLUSTER OR JUST THE SPEEDO?