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In addition to a good dyno that will let you impose a specific load on the engine, you will need two fuel flow-measuring devices--very sensitive ones. One measures the fuel coming to the engine from the tank, the other measures the fuel going back to the tank. The ones with the sort of precision you use are quite expensive, last I heard.
BSFC is fuel used per time per unit of power (or per unit of torque or per unit of pressure in the cylinder). So you have to get quantities for all three of those things--fuel used (generally by weight), time, and power or torque developed.
You can approximate BSFC for some specific points in the load/power regime if you get readings of gallons/hour of fuel use (the UG will approximate that from fuel injector duty cycle) and power or torque currently being developed. (Your UG will, if it provides those numbers at all, be approximating them from ... probably from a whole lot of inputs frankly.)
So you get approximations multiplied by approximations divided by approximations. Which means any results you get are going to be a little bit better than total wild guesses, but only a little.
-soD
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