As far as I remember the rev counter is the same on the 144 and 244 ,up to about 1980 , the blank in the middle of the binnacle once removed leaves a space to plug the rev counter in , then you need to take a trigger wire back to the coil . The whole binnacle needs to be removed to do this , also make sure you have a 4 cyl rev counter as the 6 cyl looks identicle its marked on the back
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