That would depend on what you are using it for.

If you want some pretty lights that tell you if you are richer or leaner than 14.7 then its ok.


The key thing is that on boost you want to be running high 11s or so typically.

If you were to run 13s it would be lean enough to melt your pistons and warp the head, but the narrow band gauge would still say "fully rich"


Personally i would sooner have nothing at all than a gauge that tells me the opposite of whats happening TBH