hello,
Please look at these images -

My air conditioner specification -





gauge image




Now , when I convert 2.9 Mpa to PSi then it is coming 420PSI which is way too high for the Unit because the technician says the PSI in 1.2tone unit should be around 65PSI , this Video



also says the PSI should be around 60-70 PSI for 1 HP compressor, I want to know how much PSI i need in my 1.2 tonne , 15,000 btu/h , 1.66hp Compressor capacity ? how can I convert those 2.9Mpa and 2.0Mpa to PSI of the gauge. Please tell me if there is any formula or something to get the actual PSI of the gauge, and why there are two PSI i.e. 420PSI and 60-70PSI ?

Thanks