I have used one.  I find a traditional type more convenient for 
engine tuning.  These do come in handy though for small engines and 
other applications where the usual hookup sources are not 
available.  I am amazed at how inexpensive they are now.  If it 
works, it would be worth it just for occasional special use.
I have also used one of these:
http://www.amazon.com/Sheffield-Digital-Tachometer-Secondary-Ignition/dp/B00063XVKW
It also comes in handy for certain situations.
-Steve
At 05:51 PM 2/7/2007, Randall wrote:
>Listerati :
>
>Has anyone tried using a non-contact digital tach for engine tuning ?  Eg,
>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110058739315
>
>I'm wondering how it compares to the usual "tach/dwell" meter.
 
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