Quote:
Originally Posted by monte0185
I Could see this but its tied into the oil pressure system not the tach. 
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That is strange. The only thing (aside from the light or gauge) shown wired to an oil pressure switch on the factory wiring diagrams is the electric choke on some engines.
Here's the diagram from the manual showing the location of the TRC speed switch on the valve cover:
And the diagram showing how it's wired up: