tach compatibility

[fins&gills]

will a tach from a 78 70 hp 3cyl work on a 72 65hp 3cyl

 

[Barnacle_Bill]

Re: tach compatibility

Yes, it should work with no problems.

 

[fins&gills]

Re: tach compatibility

I installed the "new" tach started it up and it still didn'work is there any way I can tell if its the tach or the wiring

 

[rickdb1boat]

Re: tach compatibility

Is your system charging? If your rectifier/regulator is bad, you will have no Tach reading. TAke a reading with the motor NOT running and see what voltage you get, Then start it up and you should see a rise in voltage. Does the tach "Zero" when you turn the key to on? Let us know the results...

 

[fins&gills]

Re: tach compatibility

the voltage readings are 12.24 when not running and about 18 running (reading is eradic but 18 is what I see. I have two tachs one is zero key on or off the other zeros when key on but neither works