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<font face="Verdana" size="2">Open the hood. Look straight down the exhaust manifold. There is a plug with a bunch of wires going to it just under the header. Thats your O2 sensor. Trace the wires back to the grey connector plug near the engine block (over on the right side, under the radiator hose). Slide back the wire shroud so you can see the wires (4 of them). Put a tap splice on the BLACK wire between the O2 sensor and the connector. <br /><img alt="" src="/diyimages/afwire.jpg" border="0" /><br />Run the wire inside the car. I recommend you not run the wire attached to the gauge through into the engine bay. It won't reach and it'll mean you'll have to splice the wires together in the engine bay. You'll be better off joining them inside the car so you minimize the exposed wire. Attach the wire you spliced into the O2 sensor to the purple wire on the back of the gauge. You need to find 12V and Ground. The Yellow/Green stripe wire that goes to the Cig lighter is 12 V, there is a screw behind the lower dash panel (w/ the lighter in it) that is a ground post, or you can run a ground wire in from the engine block (I did this). Hook up power and ground to their respective wires and thats it. <br />The gauge will oscillate back and forth between rich and lean. Don't expect it to stay in one place. It will completely disappear if you're moving and you take your foot off the gas (good old ULEV in action), and don't be surprised if it favors the lean side rather than rich (ULEV again). It should go rich if you floor it. </font><br /><img alt="" src="/diyimages/gauge.jpg" border="0" />