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Old 07 December 2013, 09:24   #1
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Are water pressure gauges useful or waste of money?

My boat is currently in the shop getting an hour meter installed. I have seen some boats with water gauges but I do not know the benefits of these. Are they worth it? What are the benefits?
I have a Tohatsu 50 tdli

Thank you!
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Old 07 December 2013, 11:20   #2
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What water pressure are the guages measuring ?

I thought the water was in an open system, so where is the pressure ?
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Old 07 December 2013, 11:30   #3
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Water pressure in the motor somewhere. I actually don't really know. Sold as water pressure gauge, but on dial face just says PRESS.
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Old 07 December 2013, 11:43   #4
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You will have some amount of pressure where the impeller drives water into the power head.

Would a gauge be useful? Depends on whether or not you actually monitor it. (Same is true of the telltale, which is a poor man's water pressure indicator. The few times I've picked up kelp that blocks the water intakes, the motor went into limp-home before I ever looked at the telltale, so I'm not sure it's the greatest primary indicator. I'm fairly sure that my monitoring would have been the same with an analog gauge.

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Old 07 December 2013, 11:44   #5
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What water pressure are the guages measuring ?

I thought the water was in an open system, so where is the pressure ?
If there was no pressure, water wouldn't circulate around the system. The pressure will be highest as it leaves the pump & gradually drop as the water moves around the system. It will still have a pressure as it leaves the engine by whichever orifice it chooses. I have N2K water pressure sensors fitted to my engines, these display pressure on my gauges & plotter. The sensors screw into the powerhead & measure pressure in the powerhead waterways. At tickover I get around 5psi, at full chat this goes up to about 20psi. Reassuring to see & not to be guessing by looking at the teltale.
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Old 07 December 2013, 12:21   #6
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So really the best solution would be a simple alarm - say a light, that comes on if the tell tale stops flowing water. No need then for pressure gauges, just a simple fow device that operates a circuit - remotely, and a light comes on the dash.

That way you dont need to look at guages, that fluctuate, just check the engine if the big red light comes on.

*patent pending*
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Old 07 December 2013, 12:27   #7
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So really the best solution would be a simple alarm - say a light, that comes on if the tell tale stops flowing water. No need then for pressure gauges, just a simple device

This is the job I give to the wife when she's onboard. If this device could be invented, then there would be no reason for the wife.....!


Hummmmmm
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Old 07 December 2013, 12:32   #8
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So really the best solution would be a simple alarm - say a light, that comes on if the tell tale stops flowing water. No need then for pressure gauges, just a simple fow device that operates a circuit - remotely, and a light comes on the dash.

That way you dont need to look at guages, that fluctuate, just check the engine if the big red light comes on.

*patent pending*
But that's too late, you don't get the alarm until the system fails. With a pressure gauge you can monitor the condition of the system & anticipate a failure before it happens. If the impellor is on its way out, you will see the water pressure gradually start to fall off over successive trips out. By having the gauges, I know the characteristics of the boat & know what I should be seeing. What you're proposing already exists, it's called an over temp alarm Which I think has already been patented
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Old 07 December 2013, 12:33   #9
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Water pressure gauge fit one YES, it could save you a p/h, when running no water pressure stop obm asap if not sooner.
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Old 07 December 2013, 12:35   #10
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So it sounds like it is a way to make sure your engine cooling system is not clogged with debris. But who knows if it is worth the extra expense of the gauge and installation.
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