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Dave Winiker
Just for info: the Data Marine knotmeter on our '87 H31 was acting up so I sent the speed sensor to DMI Marine,Inc. in MA(WWW.DMIMarine.com)for a bench check. It was, in fact, shot so they promptly sent a replacement. They sent they also sent the old one back. Anyone need a plug? I'd like to tell you the replacement was gratis but it wasn't. Anyway it was great service. I'd previously bought 2 replacement instrument covers from them.