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I use HPTuners Scanner. In addition to the parameters you listed you will also want to record: engine speed, spark timing, throttle position, vehicle speed, and possibly others. Scanning software that reads PCM data through the OBD port has advantages over a stand-alone data logger. OBD software gives you easy access to all the built-in sensors. The HPTuners interface accepts analog data from sensors you will need for AFR, and fuel press. Don't know what is available for the LT1.