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If a fuel pump dies or something similar goes wrong to cause a sudden lean condition you can blow a hole in a piston crown in a hurry and unless you're staring at the gauge it's not going to do you much good. Even if it's more gradual, say you're hard into the boost at 5000rpm and once side starts going lean, the effect on EGT is going to be hand in hand with the O2 change on that side. But again, neither is going to help you much unless you're staring at the gauge, which isn't recommended hard into the boost at 5000rpm. Display gauges are really best in the role of monitoring overall running condition. If you note that one side is 50c hotter one morning than previous mornings that's a good tip off somethings wrong. Barring data logging, at the outset they're handy for finding some open tarmac and staring at the gauge under power to ensure you're not over the top. But you're not going to watch the EGTs and O2s every time you put the loud pedal down.
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