Installed a resistor pack that provided series resistors and shunt resistors. These scale down 12V signals and provide a ground path when the signal is disconnected (switch open). This translates the input voltage in a range from 2.5V to 5.0V: 2.5V when the signal is disconnected (switch is open) , and 5.0V when the signal is 15V . With the signal at 10V, (low extreme), the input is at 3.3V. So the right threshold to program is 3.3V.

Using these inputs to monitor switch positions that power the PMAGS and fuel pump.