Funky Tach Issue

PhinAddictPhinAddict Posts: 6 Greenhorn
I've been refitting my '86 13 foot whaler with a 1984 Evinrude 30 and I wanted to add a tach to the console. I picked up a Teleflex Lido reading up to 7k RPM and I have since hooked it up and tested it out. The tach reads seemingly accurate up to about 4200 - 4400 RPM. What happens when I push the trottle a bit more is the motor revs higher but the tach starts dropping down? Anyone have an idea what might cause this? :huh

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