Spec D air Fuel gage, bought it for just to keep an eye on the mix. only problem is theres no instructions no wiring digrams no nothing. I wanted to buy the AEM wb but at 300$ it was a bit iffy, if anyone can help out that be sick!

Spec-D 2Inches Meter - Air Fuel Ratio

 

It doesn't even come with the most important part, a good wideband O2.

 

As with most other things in life you get what you pay for. Even the high dollar Autometer Wideband gauge + sensor is a piece of crap.

And don't be fooled by a name such as AEM... its just a rebranded Autometer gauge -- or so I've been told.