Wideband and EGT gauges compliment each other, the overlap is not large.
In my opinion, WB is higher up the priority list on a forced induction engine.
A decent way of knock detection is also very useful. On some engines KnockLink can be a useful instrument when fitted properly (may take time and experimentation though)
Be careful when using just EGT values for detecting lean conditions --- if you go very lean EGTs start dropping! It's easy to lose an engine from over-reliance on EGTs. They have to be interpreted in the context of the other parameters.
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