Quote:
Originally Posted by The Philpott
Optical tachometers are available below £15 (quality unknown) but it's best to weed out the non-uk sellers who try to conceal that they are thousands of miles away.
I guess if you buy one and someone subsequently borrows it and owes you a favour- then it's paid for itself.
Dave
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I won't be able to use an optical type on this engine as there nothing visibly rotating to point the thing at as everything is enclosed.
There are devices which a wire wrapped around the spark plug lead is used to detect the rpm - not sure how accurate the are