The Zeitronix ZT-2 wideband datalogger itself, with either the rectangular gauge or ZR-2 round gauge. It includes the ultra-small CPU, wideband 02 sensor, 02 sensor cable, extra long, wiring harness and serial port connecting adapter. With it and a laptop you can log air-to-fuel ratio, Lambda, two 0-5v Inputs (like mass air voltage) TPS% on 1988-2004 Fords, RPM with some, but not all vehicles. Plus you can add on a boost sensor to read boost, a high/low alarm, EGT sensor, black box datalogger and more. This unit does not include a gauge. Email us for Gauge prices. Email email@example.com for a quote. You will need a serial port on your laptop or a USB>Serial adapter to use this with a laptop without a serial port. Does not include any displays or gauges, order those separately. CA Residents we will bill you 9% Sales Tax. Sorry, no returns on any tunes or electronic equipment.