Ford Repair: a/c, orifice tube, ford mustang

Question
I am needing to know where the orifice tube is located on a 96 ford mustang 3.8L I can not seem to locate it and what the low side pressure should be when charged.

Answer
if all moisture is out of system and on a 80-85 degree day and depending on humidity-i look for a low reading of around30-40 and a high around 225-275 preferably around 250 alot depends on temp and humidity.

orifice tube is in line but if pressures are around this then orifice should be ok.