I have a 1999 225 OX66 twin engine boat. My starboard tach gage is not totally fubar, but a half inch section of the lower right corner of the display is black (not the one pictured). The only tachometer I can find, either on the Yamaha web site or even Ebay does not match my existing tachs. Is the gage on the right a direct replacement for my old gage pictured on the left? Are there any other inputs needed to make the running hour function work? I was hoping to avoid going to the new gage as it will not match the other engine and it seems expensive to buy 2 just so they "match."


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