gauges :)

[Dave]

I could never spend ££££ on gauges, but then im a cheap chap and spending more on monitoring equipment than actual engine/power/internals is besides the point of XUD. I use cheap gauges that may not be as accurate, but it gives you SOME idea of whats going on with your setup, in reality they may be 10% out, but thats still going to give you good feedback of your system and highlight problems and issues. Ash I would get an EGT gauge on there so you know how hot your running, that should be high on that list in my opinion.

I use:
Boost gauge
EGT Gauge
Oil pressure
Oil temperature

These four will generally tell you when something wrong, or your about to melt something, I now have water temp gauge, but you can normally see if something wrong on your dash...
Cheap EGT probe I never had any issues with either, although that was only ~1000 miles (heavy smoke + 25-35lb), for VNT's probably wouldnt be a bad idea getting an EMP gauge on either to kind of monitor whats going on with vanes.