What should my pressure be? Make Model Spec XJS.XJS. 3.6 COUPE, 4.0 SPORT SEDAN.XJS. 4.0 CELEBRATIONXJS. 4.0 CONVERTIBLEXJS. 4.0 COUPEXJS. 6.0 V12 CONVERTIBLEXJS. 6.0 V12 COUPEXJS. 6.0 V12 SPORT OPTXJS. OPTXLS. 5.3 V12 INCLUDES CONVERTIBLE.