On another note Ivor, I don't think it would hurt at all to add an intercooler. As long as your ECU, pump and injectors are able to supply more fuel when the engine gets more oxygen. If you've ever noticed that an engine produces more power on a cold night or early morning, it's hard to imagine why it might be a bad idea...
As for the EGT gauge, I don't see that having one will hurt. I check the recorded high on mine after each drive, just to ensure all is well.
A wide-band makes sense of course as a way to check your tune, seeing as leaning out is a major contributor to blown pistons (along with other things like ignition timing and spark dwell for example).
The last bit of power is always gained on the lean side so a tune needs to be richened up a wee bit after finding the power peak. That's possibly where most folk go wrong, trying to squeeze that last little bit of grunt out.
Or they might do something as simple as fit spark plugs that are standard instead of fitting slightly cooler ones to offset the fact that their boosted engine is now more inclined towards pre-ignition.
And yes checking for knock is a good idea if you have the means. In the old days that meant listening to the engine LOL.
If things do go wrong and combustion chamber temperatures get to pre-ignition / piston melting levels, your pistons will likely blow within a few strokes anyway so it'll all be over before you ever notice a red flashing light on the dash. Whether it's on an EGT gauge or a wide-band one.
Track days can cause the EGT to steadily rise along with various other engine temps (oil, intake, engine bay temps can all rise, even if water temp stays ok...) And the higher the temps get the closer your engine gets to pre-ignition and blown pistons, if it already has a sneaky pre-disposition.
This sums it up fairly well I think:
https://en.wikipedia.org/wiki/Pre-ignition
I've only ever blown a piston up on a bike (my old triple, shown in the first post of my Rides thread) and that was due to too much dwell on the points thanks to an old and very worn points cam (which got replaced when I rebuilt the engine). Too much dwell = too hot a spark-plug = pre-ignition even though ignition timing was set correctly. No sensors of any description on that old beast except a rev counter, a speedo and one's own built-in accelerometer. Damn was it fast on a cold night.
Which brings me back to the intercooler. Cool idea.