Now the other part is the coil. First you need to find out how many volts the coil needs. That is printed on the coil, you may need to take it apart some to see that label.
Think of the coil as just another motor but a very small one. That coil closes and opens the contacts of the starter, just like the air pressure closes and opens the contacts in the pressure switch.
Then have the pressure switch turn on and off that small motor/coil.
The heaters are just switches that are normally closed and open if the motor gets over loaded, and they are in series with your pressure switch, and they are already wired within the motor starter.
Most likely the coil is 220/240 volt and one side already fed from L-1 or L-2, you need to figure which.
Then take a wire from the other L- terminal to the pressure switch and another wire from the other side of the pressure switch back to feed the other side of the coil, there is a terminal for both of these wires, smaller than the L and T terminals.
If we knew where you are at someone close could help.
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