Air conditioner sensors locations

I took my vehicle in for an air conditioner re-gas and still it couldn’t work. Upon checking the wiring including the condenser, relay and fuse, everything was fine. The challenge was to find the location of the high and/or low pressure sensors in the car. Can you perhaps advise where I could find it? Is it inside under the dash board or anywhere in the bonnet? Please advise.
Thanks!
Gilbert