[robself705]

If the controller is on: use the voltmeter to measure 0 or 5v across the switch. If 5v the switch is closed (115 psi) if 0v the switch is open ( less than 95 psi). If that is working correctly then try measuring at the end of your pwm cable (where it attaches to the sidecar), if that is still working do a print statement for the digital input you are using. You should see it go high (1) when the sensor trips at 115 psi. If not, your sidecar has something wrong with it. Try a different digital I/O