Hmmmm...
I like this idea better!  A strobotach!  I've actually
used such things checking motor speeds onboard Naval
ships.

>You can paint white marks on something that rotates,
then use an ordinary
>fluorescent light (single tube, AC powered, *not* the
"high-efficiency"
>type) as a strobe light.  It flickers at a constant
rate of twice the power
>line frequency, 120 Hz or 7,200 flashes per minute on
US power.  If your
>object has a pair of nice fat lines on it you will see
a stationary pattern
>at 3600 rpm.  Four lines will get you a solid pattern
at 1800 rpm and 3600
>rpm.  Et cetera.  If the rotating object is not your
crankshaft pulley,
>apply the appropriate correction factor.
>
>david
>David Beierl - Providence, RI
>  http://pws.prserv.net/synergy/Vanagon/
>'84 Westy "Dutiful Passage"
>'85 GL "Poor Relation"
>
>
-Gary, San Diego
1979 Rabbit 1.5 dsl, 180,000mi(sold)
1981 Rabbit 1.6 dsl, 150,000mi(sold)
1985 Quantum 1.6 td, 145,000mi(current)

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