What should my pressure be? Make Model Spec XJ6. 3.0 SE.XJ6. 3.0 SOVERIGNXJ6. 3.0 V6 SE 19 OPTXJ8. 3.5 SPORTXJ8. 3.5 SPORT PREMIUMXJ8. 4.2 SEXJ8. 4.2 SOVERIGNXJ8. 4.2 SOVERIGN LWBXJ8. 4.2 V8 SUPER , LWBXJ8. EXECUTIVEXJ8. EXECUTIVE & SOVEREIGN 20 OPTXJ8. SPORT PREMIUM,XJ8. SUPER V8 PORTFOLIO. USXJR.XJR. 20 PERFORMANCE OPTIONXJR. 4.2 V8XJTDVI. 2.7 TDVIXJTDVI. 2.7 TDVI SPORT PREMIUM,