ok, ontick over its reading 20psi, then while hard acceleration it goes up to 10psi, i dont understand.
http://www.halfords.com/webapp/wcs/..._productId_231493_langId_-1_categoryId_165520
this is the guage. so tick over its below 0 on 20. then acceleration goes up past 0 and on 10 ish
http://www.halfords.com/webapp/wcs/..._productId_231493_langId_-1_categoryId_165520
this is the guage. so tick over its below 0 on 20. then acceleration goes up past 0 and on 10 ish