3 Phase Air Compressor

Follow the manufacturer's instructions exactly, or hire an electrician.

A surgeon Doctor can do the sugery legally and safely. Electricity also a danger thing, if it is handled without knowledge. keep away from that and hire an electrician and learn how is connecting it.

Wire the 3-phase motor power from the circuit breaker or fuses to the line side of the motor starter (top/rear), then from the load side of the starter (bottom/front) to the motor.

Wire the 1-phase control circuit from the "hot" side of its source (which may be separate from the motor source or may be from a control transformer) to an on/off switch, then to the pressure switch, then to the motor starter coil, then to the overload relay, and then finally back to the other pole (or neutral) of the control circuit source.

This is probably the most usual configuration, but there may be variations and local electrical code requirements.

I would recommend engaging an electrician to do this, or at least to "walk you through" the process.

Easy. Consult a qualified electrician.