Automotive tach on a 1985 4cyl 50HP

[raskal]

Hi there,<br /> I have a 1985 50HP Merc outboard (4 cyl). Can I use an automotive tachometer on it? The tach has capability for 4,6 or 8 cyl (I have it set on 4 cyl) but it doesn't seem to work when connected to the brown wire coming to the console (brown wire is the tach wire according to the Haynes manual).<br /><br />Any ideas or if it won't work is the tinytach the best solution. Thanks!!

 

[Trent]

Re: Automotive tach on a 1985 4cyl 50HP

Sorry your tach is not going to work on your two stroke engine.

 

[raskal]

Re: Automotive tach on a 1985 4cyl 50HP

i was afraid of that, oh well it was worth a try<br /><br />thanks for the responce!

 

[Chris1956]

Re: Automotive tach on a 1985 4cyl 50HP

rascal, The tach wire is connected to the stator. The marine tachometers count the number of pulses the stator makes and correctd for RPM. A lot of Merc Stators are 12 pole. I will guess that is the number of pulses per rev. If you had a setting for a 24 cylinder engine, it might work.