Fitting Tachometer

[Dolph13]

I'm fitting a tachometer (rev counter) on my Mariner 55hp two stroke. Its from early to mid 90's. Never had a serial number plate so unsure of exact year. Need to know how many poles engine has so i can get right gauge and also callibrate it correctly. Know it shouldnt be run at more than 5500 revs. Tried looking on various pdf tables of engines and suggested pole numbers but not 100% sure of which engine mine is listed as. Does anyone know how poles these engines have or do they vary from year to year or model to model. Do i have to get a Mariner gauge or are other decent brands suitable?

 

[VicS]

If no one here knows try asking on the Mercury / Mariner board of the iBoats and /or MarineEngine.com forums

 

[rogerthebodger]

I fitted a tachometer to a Yamaha 85hp 2 stroke 3 cylinder outboard. The tacho ha a selector switch to match the outboard.

This document may help you is selecting the number of poles

https://productimageserver.com/literature/ownersManual/83985OM.pdf

what is the number of cylinders is your mariner

Form memory if its 2 cylinder its a 4 pole if its 1 3 cylinder it will be 6 pole for 2 stroke engines.

 

[PaulRainbow]

Does not have to be a Mariner branded tacho, the Faria range that Roger posted the pdf from is as good as anything, available from ASAP: Marine Tachometer Rev Counter Gauges

Other suppliers are no doubt available, the ASAP page at least shows some options.

 

[Stemar]

Tiny Tachs could be worth a look. They work off a plug lead, so no worries about the right one for your engine - just don't get the diesel version!