1981 235 Johnson changed to a 1977 Rude 140. Different tach pulse?

ghostwave

Seaman Apprentice
Joined
Jul 17, 2012
Messages
34
My 1981 Hydrasports originally came with a 235 Johnson Sea Horse. I pulled that and put on my old Rude 140. Can anyone tell me whether the tach pulse off the Rude would be different from that of the Sea Horse in terms of readings? I'm showing 5000 RPMS on the Rude at WOT, but not much speed (of course, I'm also aware that the 'not much speed' might be due to a simple lack of horsepower). I'm running a line straight off the rectifier/wiring connector to the original tach that came with the boat because the signal is not making it through the wiring harness to the tach for some reason.
THX
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 1981 235 Johnson changed to a 1977 Rude 140. Different tach pulse?

Tach should be set on 6 P for both mtrs.
 
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