Eckler's no longer carries the Edelbrock 91169 Qwikdata 2 Card; Adapter X4 Thermister; X8 0-5 Analog.
Please check out El Camino/Caballero/Sprint Custom Tuners for an updated selection.
Voltage and ground state sensors are designed to convert a switched positive voltage or ground to a 0-5 volt output for logging with any analog channel input.