Regulator Rectifier Assy Mercury, Mariner 75 90hp 4 stroke 510 37 02 Replaces 42943A1 Replaces 42943A1 BF 40 2007 2014 The new harness incorporates a tachometer (tach) signal lead for connection to your existing tach where as the old regulator had an extra wire in which the tach signal wire was connected there is no tach hookup therefore you will not have a working tach unless you have the newer style engine harness already installed on the outboard
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