Well its true it is a cheap recharge.  I don't want to spend any $ because you never know when the government will seize your car so it doesn't make sense to pay extra for correct repairs.  I only have access to a low pressure reading.  I think it is overcharged so I let some off.  It seems to work when temperatures are lower than 90 degrees but shuts off on temperatures above 105 or so I believe the pressure is still high.  It does have a slight leak so I was figuring just let it sit until it naturally lowers pressure to 40 psi on the low end.  I called a dealership and one of the techs told me never to let the low pressure get above 45 psi.