Since the starter/coil is not easy to get to , you can measure the "S" terminal voltage at the wire coming off the starter interlock switch. This switch is mounted directly in front of the clutch pedal arm. Two wires come from the switch to a 2-position connector. On my Miata they are black/red stripe wires and a thicker gauge than the other wires you'll see under there. One wire comes from the ignition switch, the other goes to the "S" terminal in the engine bay. Stick a volt-meter lead into the back of connector into either connector wire and the other ground lead to a ground point.
Press in the clutch pedal, Start the engine and look at the voltage per the instructions above
You can also disconnect the switch at the connector and put a jumper wire in the ignition wire side of the connector. Press in the clutch and turn the ignition to start. If the switch was bad the car should start.