Not sure on the OX66, but earlier carbed engines had a seperate pickup for the digital tach. My 93 250 parts engine had a seperate tach pickup mounted that read off of the flywheel I bleieve. It had a seperate crank trigger under the flywheel, but had a magenetic pickup on the outside of it for the tach(at least thats what I was told it was for). I believe it was only for the digital tachs.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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