What Tachometer should I use?

[danamul1977]

My tach went the last time I was out (not sure if that was from some other problem) I'm not sure what tacho would work with my motor. Mercury 1990 V-200. Not sure if a 4-6-12 pole would work, or if a 4-cycle gas type would work, maybe none of those. What im thinking is its a 3 pulse 6 pole, but really dont know.

 

[Chris1956]

Re: What Tachometer should I use?

Mercs are usually 12P. That is the same as 6c. Any marine OB tach will likely work. Look for your application listed on the brochure.

 

[danamul1977]

Re: What Tachometer should I use?

K thx Chris appreciate it, I didnt want to buy the wrong tach

 

[danamul1977]

Re: What Tachometer should I use?

What would happen if I used the wrong type, would it just not work or give the wrong reading?

 

[carholme]

Re: What Tachometer should I use?

You have not provided the s/n of your engine but if it is a 1990, here is the parts list:

200 H.P. (V-6) - Mercury, Mercruiser, Force, etc. Parts Lookup

See tachometer, item 1 under INSTRUMENTATION (MERCURY AND MARINER)

Gerry

 

[Chris1956]

Re: What Tachometer should I use?

If you used the wrong setting on the correct OB Tach, you would have a bad reading, high or low. If you used an automotive type tach, I am not sure what reading (if any) you would have. I would guess it depended on what type of tach it was.

Break out the oscilloscope, and lets check the signal!

 

[danamul1977]

Re: What Tachometer should I use?

Thx Carholme and Chris. The Tach was set at 4 from a range of 1-4 it was reading 4400 rpm's at wot before it died. Now in not sure if its my prop or the tach was set to high. From my memory of something I read the tach should of been set at 3. If anyone knows what I should set it at that would be really helpful. The s/n on my motor comes up as a trolling motor. but I have the range 5624878 THRU 0C100860 its the V-200 Dual carb 2.4L 1990 mercury.

 

[carholme]

Re: What Tachometer should I use?

What p/n and make is the original tach?

Why not just post the engine s/n? You say you have a range of 5624878 THRU 0C100860 but OC100860 comes up as:

200 V-200 V6 0B241881 0C100860 1988 USA not 1990.

Gerry

 

[danamul1977]

Re: What Tachometer should I use?

What p/n and make is the original tach?

Why not just post the engine s/n? You say you have a range of 5624878 THRU 0C100860 but OC100860 comes up as:

200 V-200 V6 0B241881 0C100860 1988 USA not 1990.

Gerry

My serial # comes up as a 10hp trolling motor really no need to list it (I dont know why). The 1988 model I think is the same as the 1990 just sold at a different year. If anyone knows what I should set the tach to for the 1988 I think that would work. Im pretty sure its 3 but the one that was on it was set to 4. =] Thx for any help