Attn: Yamaha Mechs. (Water temp Gauge) install

77SceptreOB · #1 02-14-2010, 05:18 PM

Guys,

I'm wanting to install a Water Temp. Gauge. I've got a 225hp V-6 Yamaha (1989). See pictures below. It appears and I have read that Yamaha has conveinently put (2) bosses for future use one on top of each head. I just want to make sure these are the ones. Each head also appears to have a "thero-switch" that sents a signal regarding the temp to the control console / warning horn. I don't want to mess with those. I figure I should use the top "bosses" to put the sending unit(s) in. Then I will run dual wires up to the dash, then install a toggle switch before the gauge so I can monitor both cylinder banks independently.

What do you all think??? Does this seem correct??

jwclbi · #2 02-14-2010, 06:46 PM

Im not yamaha mech but lived in SC for years, is that snow in your splash well? Not trying to change subject and good luck with it!

77SceptreOB · #3 02-14-2010, 07:53 PM

Quote:

Im not yamaha mech but lived in SC for years, is that snow in your splash well?

Yep! We got 8" Friday night, unbelievable!

Old'sCool · #4 02-15-2010, 04:09 PM

That looks like the same place my water pressure gauge thermocouple was on 250 OX66

77SceptreOB · #5 02-16-2010, 12:38 AM

Well to answer my own question:

Yes, I have learned those are the "bosses" for either a Water Temp. Gauge or a Water Pressure Gauge. If you order from Teleflex, you will need a special adaptor to fit the Yamaha boss. The Yamaha motor uses a M14 metric sized port. The standard temp sender unit provided by Teleflex in the Water Temp. Gauge kit will not fit the Yamaha port. The special adaptor is Teleflex P/N 61886P.

FWIW, the Teleflex Water temp. gauge is a lot more detailed and much easier to read than the OEM Yamaha gauge.