I think Splitfire are the only guages that have a silver bezel and a silver face. You can also get a replacement Splitfire bezel in chrome if you have a chrome tacho. Race -X do a brushed aluminium bezel and silver faces.
Stewart Warner makes the gauges in the MCS Auxiliary Gauge Kit (pn 82-94-0-393-994). The Vacuum/Boost gauge in this kit looks similar to the following one from their Competition Series, except it has "two tics" beyond 15 psi and Cooper S on the face:
The innovate stuff is very nice and more than likely what i'll be piocking when i do mine. ThinkMINI are an official dealer for them i think.... might be wioth checking out Bhozars innovate stuff and Lucky Daves.
These are the official mini ones fitted in August, the black face they replaced are no longer available (from MINI you can still get them from VDO) They do look darker than the ones listed on MINI's site but according to the stealers are the same just mounted beneath the switches