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Tachometer interface for old OMCs
Submitted By: Paul Moir
Date Created: 10-04-2007
Description: This is a black box which interfaces an old OMC (Gale/Johnson/Evinrude) 2 cylinder outboard with an automotive tachometer. While this interface has only been tested with the OMC universal magneto, I expect it would work on most any magneto that can produce two pulses per revolution with a little tweaking.
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Schematic

Circuit Description, First Half

Signal at pin 6

Circuit Description, Second Half

Output from Schmitt

Bill's simplification

Construction

Revision
 
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