Ack no multi quote here. Ay yi.
… yes it is. Narrowband implies exactly that. That it’s only accurate around the midpoint of the reading range. Anything outside of stoich and the accuracy becomes essentially non existent. So if you are using the narrowband output you still have narrowband accuracy. Here is a graph showing the issue.
Only a gauge specifically setup to be a wide band gauge, running off a wide band 02 signal is accurate and should be used for tuning.
N’CTRL:
The gauge I posted is NOT a wideband gauge. It’s a normal a/f gauge. In order to read wideband 02 you need a wideband 02 sensor and controller, and then a gauge designed for that particular setup. Most of the gauges etc are not compatible between setups. Whoever provided the wideband setup can get you their own gauge, for instance if you have an Innovative LM-1 you’d get hte Innovative Wideband gauge.