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Tommy,

We have had an article on OMC gauges for years in the article section under "Engine Gauges".
What series of OMC gauges do you have?
http://www.whalercentral.com/articles...icle_id=43

Here is an article on adding an OMC System Check Tach to the older engines.
http://www.whalercentral.com/articles...icle_id=72