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AR15.COM
4/28/2013 2:39:20 PM EDT
I thought maybe one or two of you might be interested in this.  I was wondering how accurate the tach in my plane was, so I bought one of these Glo-Bee digital tachs for $25.

http://secure.hobbyzone.com/GPMP2500.html

I tested it with a light bulb, signal generator, and a frequency counter, and it is dead accurate.  I pointed it out my windshield, and it worked great.  The tach in my plane reads 50 RPM low at full power.
4/29/2013 5:11:17 AM EDT
[#1]
I've used a similar product for years, they work great!