Technically 2.75 is ideal but difference to 3 inch is nothing to get bent out of shape about.
From scratch i would go 2.75
At least get a price off Mudski for the Dawes gear etc.
No affilliation but he's a forum dude so good to support if it works out OK.
If the dump isn't already tapped for a probe get the probe thread spec first and tell the mob that is what you want.
There are a couple of thread options and trying to get adapters or matching thermocouple compression fittings is silly when you can get the correct thread first up.
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