Adjustment Tool

Adjustment Tool
I have a 1984 mariner 50 outboard with a tach that needs adjustment. How do I find actual motor rpms to set it

The tach has a screw on the back that changes the needle position on the guage and it does adjust it and works fine. I just dont know how to find out what the actual rpms are in order to syncronize it to my motor. I am hoping there is a tool or something that will be easy to use to do this.The screw has the numbers 1,2,3,4 written around it something like a clock. This tach is a factory piece of equipment and is hooked into my motor through a plug in my controll box. This motor is the same as a Mercury 45. It is 4 cylinder.

those numbers don't mean you can simply "adjust" the tach. they are relative to the number of poles on the alternator. go online and find the manufacturer of the tach. call their tech help line and someone can tell you what # to set it on.

Aimpoint Optics Adjustment Tool

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