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Ah, so I see the answer is no, that can't be done.
The MTH field doesn't let you multiply or divide by a gauge or a data stream, just by a constant. Although the stock mpg and cpm gauges involve division of one data stream by another, I don't see any way to add such gauges to the SGII, so I suppose the BSFC gauge is never going to happen. :-(
I see the stock Horsepower gauge has a multiplication by 4.35 built in. I could correct this value to make it accurate at at least one point on the torque vs. RPM curve, but I don't know what method the SG uses to calculate HP, and I'm skeptical about its accuracy.
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