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MG MGB Technical - Good gage for telling exact rpm

I am not sure that my tach is reading correctly is there a good tool that's inexpensive that could tell me roughly what it is reading?
Josh

Any decent dwell/tach will give a good indicator of RPM to check against the tach. They are relatively inexpensive, and using the dwell function will help check points gap.
Paul Konkle

My tach reads about 300 RPM too low when compared to the reading I get on the dwell/tach meter (which I believe to be accurate). Is there a way to adjust the tach? I've looked for a set screw on the back of the tach but couldn't find anything obvious. There is a rubber grommet pluging a hole - might it be under there? The car is a 1968 mgb roadster.

Thanks for any advice.
BOS

This thread was discussed between 15/05/2002 and 16/05/2002

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.