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40-45mpg? What % of that was highway?
One of the gauges I find invaluable is a wideband AFR gauge. You will have to replace your O2 sensor, but it will tell you what your scangauge can't.
The other gauge I would use is an ammeter. This will let you measure the power draw of various electric devices in your vehicle and can tell you much more than a voltmeter.
As for voltage, vacuum and water temperature, these are things the SG actually does well. I wouldn't bother with an oil pressure gauge unless you plan on running a lighter than recommended viscosity.
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