Like you, I just want to use it to ensure mixture is set properly. So I initially started looking for portable CO2 monitors but the AFR gauge seems to be the most cost effective solution. I may not even mount the gauge - just remove and plug the bung after I set the mixture.
Looks like youíve been running yours for years. Have you had to replace the sensor ever? That seems to be a common failure. Iím also leaning toward AEM.
I have not had any problems with my AEM unit.
It is interesting to have it installed. Setting mixture takes a bit of time so it is nice to have the numbers right in front of you. The %CO MB quotes is different depending on engine load. Also different at idle. I am sure I posted the numbers elsewhere on this forum. My car now runs well under moderate load at about 14.0 AFR.
At idle I set it quite rich. This, along with increasing fuel pressure, overcame the hot start problem that is caused by too lean a mixture. Changing fuel pressure requires MPS adjustment to get all mixtures right but helps the djet run better. (I thig I am at about 32-34psig)
At one time, engine was running lean (on meter). I thought meter might be wrong. I added injector cleaner, and the number came back to normal. I just like to see the AFR!
Anyway, just some examples of how a built in wideband AFR can help. (By the way, make sure you get a wideband
meter like the AEM)
By the way, this is the clamp on bung. About same price as C$50 weld job!