On the clk,
with key on- set temp. controls to 72 on left and right, press the REST button and hold it for more than 6 seconds. When the display changes press the left auto button to change the number shown on the left. Press until the number 7 is displayed on the left- the number shown on the right will be your system pressure in BAR on the high side.
As long as the sensor is working correctly this is your pressure, with that said.. are you hooking up the the low side or the high side with your gauge? They are different in size.
Components location for A/C system
Figure 1
A High pressure connection
B Low pressure connection (engine 112)
B12 Refrigerant pressure sensor
B12/1 Refrigerant temperature sensor
1 A/C compressor
2 High pressure line
3 Condenser
4 Low pressure line
5 Receiver/dryer
6 Suction line
7 Low pressure line to evaporator
8 Expansion valve
9 Evaporator
