Innovate 3844 MTX-L Digital Wideband Air Fuel Gauge Kit
You'll get opinions from everyone that has bought one and in my opinion innovate AFR gauges are the best and most accurate. I think they are the only ones that you can recalibrate to new or aging bosch wideband oxygen sensors.
I used to have an innovate LC-1 with analog G3 gauge and now I have the innovate MTX-L digital AFR gauge that has a more modern and simpler digital controller built into the gauge body than the earlier seperate analog LC-1 controller.
It is incredibly accurate and stable and it hooks up really easy with only 3 wires and the cable from the oxygen sensor to the gauge that plugs in.
They sell a longer sheilded extension cable with the special plugs on the ends to go from the gauge back to the wideband oxygen sensor than the 8 foot long cable that comes with the gauge for around $45, you'll need that.
A weld on O2 sensor bung is included.
oh yeah, no need for a computer so MAC or PC makes no diference...