You may have some trouble finding a cyclecat top triple, as they aren't making them in large numbers anymore
As for new / updated gauges, do a quick search through this forum, as there are a lot of threads on this subject.
The real questions are:
How much do you want to spend? Options for gauges run from ~$100 (used gauges from other model monsters of the 'older than 2001' variety on eBay) to $600+ (Motogadget with all the add-on sensors)
How much wiring do you want to do? Used gauges from other monsters should be close to plug-and-play with a few extra bits of wiring. Something aftermarket will require you to wire it in to the existing harness and/or cannibalize your old gauge connector and wire it up to the new one.
Your options depend a lot on your answers.
Good Luck!