I have to respectfully disagree with the "aren't" part of that...a boost gauge isn't critical, but IMHO an EGT gauge is the most important gauge to have.

I was thinking on the lines of using the #3 spot for either a "real" voltmeter or a tranny temp gauge...

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2001 VW Jetta TDI, 5 speed, daily driver
1991 Ford F-350, work in progress
1984 Ford F-250 4x4, 6.9l turbo diesel, 5 speed manual
Previous oilburners: 1980 IH Scout, 1984 E-350, 1985 M-B 300D, 1979 M-B 300SD, 1983 M-B 300D
Spark-free since 1999