Air/Fuel Gauge hookup?
 

anyone know how to hook one of these up?
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SC2 REPLAYS

You tap the O2 sensor signal wire generally. The gauges usually also have a 12V switched power and a ground to hook up as well. As to what wire to tap on a Protege, couldn't tell ya.

they are easy to hook up. you'll just need to figure out which of the wires on your o2 sensor is the actual sensor wire. 2 of the wires will be grounds (-), one will be very low voltage ( <1 volt, it will be your sensor wire) and one will be higer voltage which is the sensor heater wire.
the guage just needs a switched 12v (+) and (-) and the sensor wire.

what mods are you doing that you need to monitor your unadjustable a/f ratio? nitrous? turbo?;)

right now just for looks (to go with steering column gauge pod), maybe later a turbo, since their are no kits and everything must be custom fab. i gotta wait

is the O2 sensor located on the heat shield right behind the RAD?

there is a "no touch" sign on the sheild and to the right there is a sensor, is that the one im looking for?
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Volcano vaporizer

There are two of them. You are probably looking at the primary one. Whether you should tap into the primary or secondary sensor is a tricky question.

yeah i noticed 2, 1 closer to the valve cover 1 at the bottom of the car.. hmm... anyone install one of these before?
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FORD CVH ENGINE SPECIFICATIONS

You want to tap into the one on the upper manifold. The black wires are both grounds. Ask CH design which of the others is the heater or signal. It should be in one of his posts about O2 sensors here somewhere.