What O2 sensor do I use? I saw on other cars they used the one off the cat. Is that were I get the feed? any help would be great?

 

Are you using one of those cheap gauges that use a stock O2 sensor? I am sorry to say, all you're going to get out of that is a light show. The stock O2 sensor is too slow and not accurate enough to provide a useful reading on an A/F meter. Ricey...

Good A/F meters, that use their own broad band O2 sensors, give you fast, accurate data. And they are pricey, like $400+. But they will provide timely, actionable readings/information.

Good luck.

 

so you are saying that autometer is cheap?
i have heard that they are fast enough.

 

Compared to the high-quality gauges available in the marketplace, the Autometer AFR gauge is very inexpensive (cheap). There's nothing wrong with cheap, as long as the gauge delivers what you expect it to deliver.

All you'll get with that gauge and a stock O2 sensor is a light show. The gauge is going to jump back and forth between rich, stoich, and lean. The position of the indicator will not be a real-time reading, nor will it accurately represent the AF ratio.

Unless you plan to invest in a higher-quality AFR gauge, one that comes with its own broad-band sensor, you might want to consider using an Exhaust Gas Temperature Gauge instead. The EGT gauge and its heat probe will cost about 1/2 of what a good AFR costs... I got the Autometer #4365 EGT gauge and a #5244 heat probe for about $200 from Summit Racing.

Good luck.

 

still can't the afr from autometer be useful for tuning the ratio at idle. Then it would not need to be real time for the car stays in idle. Also, is it possible to hook up the gauge to an aftermarket O2 sensor? I have heard of people buying three wire O2 sensors and hooking that up to the gauge.

 

It boils down to how compelling your need is to protect your engine. If you are basically stock, there's no compelling need for accurate, real-time readings on a gauge. Your near-stock set-up will look after itself. The AFR you have now will be absolutely fine. And a "good" gauge would be woefully unnecessary.

If you plan to invest a significant sum in a supercharger and/or a nitrous oxide set-up, and/or a built-up engine, your *need* for accurate, real-time information will be more compelling. Excellent, timely information will protect your engine, and perhaps, save your life.

Continue to ask around. Research this issue another week or so. Weigh all the opinions offered to you. Make the call. Live with it.

Good luck.