Electric tachs, c

[William Hartwell Woodruff <woodruff@engin.umich.edu>]

        Speaking of cool electrical things (air/fuel sensor), I never got
a response when I asked if anyone new how to build a device which would 
fix my electric tach.  I have swapped a 6 cylinder engine in place of the 
4 in my Spitfire and the tach is (surprise!) off by a factor of 1.5.  I
think Phil might sent me some theory, but no actual devices were described.

woodruff@engin.umich.edu