Anyone ever used KET Gauges?

[kenlaw50n]

Have fitted these in the car but not sure if they are accurate or not or if I've wired them correctly.

Micro Digital Turbo Boost (BAR) Gauge,Autometer, 37mm | eBay

 

[Broken Byzan]

The boost gauge seems ok, but the oil pressure sensors on the oil pressure gauge is rubbish. I am on my 3rd on my car and 2nd on the wifes. Cheap enough tho I guess

 

[kenlaw50n]

Could we not use another pressure sensor or are they bespoke to the gauge?