Yet another tach question.

[steviecops]

Hi<br />I'm running a 1980 Johnson 55 2 cylinder, on a 17ft tri-hull fishing boat that weighs about 1000lb, (don't know exact weight). My prop is a 11 3/4 X 17, but I don't know if this is the right prop because I don't have a tach fitted.<br /><br />Could anyone tell me which tacho I could use for my engine? I haven't seen any on the parts web sites, and the only one I've seen on e-bay is one for a 4 or 6 cylinder engine. Could I use a motor cycle tacho? After all, it would be for a 2 stroke and 2 cylinder engine.<br /><br />Also, if I buy a non OMC tacho, can I buy the plug that fits with the one on my control box, as a part on it's own?<br /><br />Thanks in advance.<br />Steve

 

[rickdb1boat]

Re: Yet another tach question.

Any Tach. that can be set to 6 pole will work and connect to your control box outlet(Separate wiring harness required). Teleflex has a ton of them on Overtons or West Marine and others.... Or, there's always Tinytach, which will work on anything...<br /><br /> www.tinytach.com<br /><br /> Harness at Cabelas $35.00<br /> Tachs are about $55.00

 

[steviecops]

Re: Yet another tach question.

O.K, Thanks ;o)

 

[SCO]

Re: Yet another tach question.

BTW stevie, My 4 cyl Johnson tach also sets to the 6p position.

 

[steviecops]

Re: Yet another tach question.

If I get a non OMC tach, could I make my own wiring harness? The plug on my control box looks the same as the connection used on my ignition coils. Is this type of plug a standard OMC part?<br /><br />If so, does anyone know what colour wires in my control box, go to what positions on the tach? My manual doesn't include the wiring diagram for tachographs.<br /><br />Thanks<br />Steve

 

[rickdb1boat]

Re: Yet another tach question.

If you have a Gray wire hanging around under your console and isn't connected to anything, it's for the tach sending terminal. Check around..