Make Model Spec DISCOVERY II. 16 OPT II.DISCOVERY II. 18 OPTDISCOVERY II. 2.5 TD5 16 STEEL COMMERCIALDISCOVERY II. E, SDISCOVERY II. GSDISCOVERY II. XS, ES 18DISCOVERY. ALL MODEL BASE.DISCOVERY. ALL MODELSDISCOVERY. E, SDISCOVERY. SE, HSEDISCOVERY. SERIES IIDISCOVERY. SERIES II OPT What should my pressure be?