Pressure Guage Attachment Points, 928S4
There are two places to hook the A/C gauges: the high side (red gauge) goes on the schrader valve on the receiver/dryer between the A/C condenser and the front bumper cover; and the low side (blue gauge) goes on the schrader valve located on the low pressure line between the radiator and the engine on the right fender (USA cars) just under the right ignition coil (most cars). This valve is very difficult to get to, especially when the engine is hot. You WILL get first degree burns on you arm hooking up the hose. Unhooking the hose is even more fun when the freon sprays out - burns and frostbite at the same time - what fun!
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