RPM Gauge on Merc 150 V6 Carb motor not calibrated

[Luc Perreau]

Hi guys, how do i calibrate a mercury RPM gauge? I have it set on 6P, is that right? If not, what do i set to and how do i calibrate it?

 

[fastjeff]

Use 12P

Jeff

 

[Luc Perreau]

I don't have 12P. See below.

 

[galamb]

I suspect you have a 6000 rpms dual purpose tach there that was not designed to work with your current outboard. Some 6000 rpms tachs do have the option for 12 poles (normally piggy backed with the 4C option) not in this case.

You need an outboard tach (7000 rpm) gauge - it may not have poles listed on the back the way this one does.

They often have 5 settings:

1 = 2 pole, 2 = 4 pole, 3 = 6 pole, 4 = 8 pole and 5 = 12 pole

 

[Luc Perreau]

Ur right, it is a 6000rpms gauge. That means there is no way it will work with my motor? If not, which motors will it work on?

 

[galamb]

It will work on all inboard/outboards (mercruiser etc) and check out this link (pdf) for a list of outboards and the number of poles they have..
http://faria-instruments.com/site_manuals/IS0086_S_Outboard_Tach_Applications.pdf

 

[guyjg]

Where are you located and what brand of gauge do you need/want?

 

[Luc Perreau]

I am from Seychelles and i need a Mercury RPM gauge that will work with a 1992 Merc 150 V6 2 stroke carb motor. My existing gauge is. Mercury RPM gauge and the pic above shows the settings on it.

You guys said it will work with all inboard and outboards, but why is it not accurate on mine? Do i need to use it with the adapter?

 

[Luc Perreau]

I think my gauge will work. See here: http://www.mercurymarine.com/servic...intenance/faqs/outboards/?category=electrical

Go to the bottom of the page.