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Depending on the engine I'd suggest either the Badger Vision 1000 for small engines, or the Badger Vision 2000 for bigger engines. I've seen a couple of articles on using the 2000 for use on tractors & industrial engines, but they're to big for use on engines like the VW 1500 & 1600 diesels. For something like that you need a transducer like the vision 1000. As for the Savant FS-3400AH which is sold by some of the electronics retailers as the FLOWFUEL30L0 by Futurelec, its max flow rate is below what the small VW diesels will flow on the input to the injection pump @ full throttle.