wrote in
oups.com:

maybe the tach meter was whacked.

Analog frequency meter. The timing capacitor in them changes value and
they read wrong.

There IS an easy solution that is very accurate:
http://www.tinytach.com/tinytach/diesel.php
Even comes with a runtime hour meter that only times when the engine is
actually running...not when the switch is on.

--
Larry

You know you've had a rough night when you wake up and your outlined in
chalk.