Toyota Repair: 1985 toyota pickup, toyota pickup, side switch

Question
I have a 1985 toyota pickup 2.4 FI 4x4. When AC is turned on there is power to the dash but there is no power to the compressor. I was trying to find the high pressure and low presure switch. Can give some suggestion and where to locate the pressure switch Please?

Answer
There is only a high pressure side switch located in the evaporatir housing which is almost never the problem, the compressor is probably not engaging because the freon pressures are low due to a leak in the system so the first thing that needs to be done is to make sure that the freon pressures are good and there is enough freon in the system.