Few things to keep in mind.
1) Get a Boost gauge; not a boost + vac gauge (diesels don't typically have Vac.
2) EGT is nice Have one on my Gasoline car; need one on my Diesel.
3) Coolest Turbo Diesel Gauges
McNallyelectronics.com : Home (Expensive though)
4) MPGino is super cool and *should* be able to be adapted fairly easily.