Instruments

hesper · Post by **hesper** » Mon Jul 11, 2005 12:09 pm

Just installed a used Volvo diesel that is rated at 2400 rpm max.

My previous setup included a mechanical tachometer. This engine has pickups for rpm, temp, pressure. Any recommendations for good but reasonably priced instruments? Our friends at W**t Marine stock plenty of 7000 rpm tach's but I'm really hoping I don't get that high!

Jim

George ( C&C 40 ) · Post by **George ( C&C 40 )** » Tue Jul 12, 2005 10:14 am

Hi Jim,

When I re-did the tach on my Triton I had to hunt around a bit for a "Diesel" tachometer. The diesel tachs go from 0 - 3600 RPM.

Personally, I would prefer the flywheel sender and tach combination that is made by the engine manufacturer. For example, I have a 25 year old Yanmar 3QM30(H) engine in my C&C40 but was still able to get the OEM flywheel sender and tachometer from a Yanmar dealer last year. I like flywheel driven tach systems because they are always exactly correct. You need a strobe to set up an alternator driven tach system even somewhat correctly and then you never really know.

Good luck with the project,

George Jones

George ( C&C 40 ) · Post by **George ( C&C 40 )** » Tue Jul 12, 2005 6:04 pm

Hi Again Jim,

I forgot to mention the really cheap alternative to expensive OEM tach systems -- don't put a tach in at all. You don't really need one, and it's just another system to maintain.

Take Care,

George Jones

Noah · Post by **Noah** » Tue Jul 12, 2005 6:45 pm

The one on my Universal diesel takes the tach input from the alternator. You can then adjust the tach to calibrate it.