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I have one fitted to my 1990 Eunos/Miata (purely because it is too old for any aftermarket data programs to run on).
It lets me 'see' the pressure in the intlet manifold between the throttle body and the cylinders.
It basically regulates my right foot and helps me accelerate or maintain speed more effeciently.
Its amazing how often at most speeds I can back off the gas a tiny bit, yet still maintain the same speed?!
I'm sure someone will correct me if I'm wrong, but if I'm able to restrict how open the throttle butterfly is, based on what I can see the vacuum gauge doing, then I can run the motor a little more 'lean'.
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