Originally Posted by Robber98
Im just wondering what o2 sensor is needed for a halmeter a/f ratio gauge and where the best place to get one is. Thanks Rob Murray
You can use almost any stock narrow band 3 wire O2 sensor from any auto parts store. They can be had for as low as $25.
The poblem is, the cheap halmeter <$200 unit is nothing but a light show. It uses a narrow band sensor that only reads with any resolution at 14.5 to 14.8 or so. The Halmeter itself is nothing but a LED driver.
You cannot use this for tuning any engine. It is only good to tell you if it is idling at near the proper a/f ratio. Under any throttle dynamics, it is just a light show that flickers all over the place. You need a Wide Band System to do any real tuning or checking of your a/f ratio, A wide band system is going to cost well over $200. You need to look at the AEM or Innovate units.
Also keep in mind that either type of sensor (narrow or wide band) have a limited lfe when using leaded fuels. (20 to 100 hrs at best)
If you want to use an o2 system for tuning (an excellent idea), give us a call and we can help with the best solutions.