> I noticed that the tach
> seemed to be reading high
A very common problem, indicates wear inside the head. As the brass bushing
wears, the magnets sag closer to the cup & so have more effect on it.
> Is there any info on how to calibrate a mechanical tach
See Tony Rhodes' article at
http://mywebpages.comcast.net/rhodes/speedo.html
for the best info I know of (which still isn't much).
> were there different drive ratios on various TR models.
Nope, all the TRactor motors turned the tach shaft at camshaft speed (1/2
crank speed).
Randall
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