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Old May 23, 2002, 07:11 AM
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in persuit of low wing loading
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Boston, Mass
Joined May 2001
6,463 Posts
Dave,
I forgot to mention, for my digital tach, I rigged up a 12-volt halogen car headlight bulb which I position in front of the prop so it can shine through to the tach. I power this from either my 12v power supply, or my 12v field battery. You are right, even regular incandescent bulbs cause the tach to read incorrectly. With the 12v car bulb, you can turn off your room light if it is nearly overhead and interfering with your tach and you will still be able to see. In fact, I often plug in the car bulb when I'm working on tiny stuff because it throws off such good light.
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