Just seen this on ebay and wondered what you guys think of these. Do you think they would be any good?

Define good.

To have a useful AFR reading, you need a wideband lambda sensor, so no it's not going to be very good.

If, however, all you want is something that gives you a very rough idea of if you're fuelling is ok, then it's probably much the same as any other afr guage you can buy.

I wouldn't bother, myself.

I should point out, that i do have an afr guage. Although it was on the car when i bought it.

Looks good if you like flashing lights though. And guaranteed, every single person that gets in the car will ask what it's for. You can have fun making up some good stories.

Im gonna be getting one myself soon, a Splitfire one to match my boost gauge. Then pop them both in a Nomad twin pod pillar.