By mechanical I mean, reading is taken directly from oil flow to the gauge. What I have in the engine room is Murphy 20P-150. One of them has failed. Tried cleaning it internally with carb cleaner...helped for awhile but now back to reading 5 lbs (when pressure really is 35+ lbs)
When I did a gauge swap between engines I noticed the working one was obviously newer, so this isn't the first Murphy failure in the boat's history.
Therefore wondering if I should order another Murphy or some other make. (for 2" nominal opening)
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Who makes the most accurate and reliable mechanical oil pressure gauge ?
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09-29-2015 09:42 PM #2Senior Member
- Join Date
- Jan 2006
- Posts
- 822
Re: Who makes the most accurate and reliable mechanical oil pressure gauge ?
We used Stewart-Warner marine series
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Re: Who makes the most accurate and reliable mechanical oil pressure gauge ?
I would avoid Stewart-Warner. Mine have been a big disappointment.
--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375
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09-30-2015 07:08 AM #4
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Re: Who makes the most accurate and reliable mechanical oil pressure gauge ?
I agree. The last few SW mechanical gauges were not accurate and had to return one right out of the box.
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Re: Who makes the most accurate and reliable mechanical oil pressure gauge ?
Dan
End Of The Line II
1967 34C
EOTL II Rebuild Web Page
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Re: Who makes the most accurate and reliable mechanical oil pressure gauge ?
Mexico.
Electrical gauges, two had defects right out of the box, and the bezels on the "Marine Deluxe" tachometers developed bad rust after about a year.--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375
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09-30-2015 11:36 AM #8
Re: Who makes the most accurate and reliable mechanical oil pressure gauge ?
So what's that leave, Murphy, Isspro and VDO? Have had good luck with the last two, no direct experience with Murphy though they have a good rep.
George
Former Owner: "Incentive" 1981 56MY
2007-2014
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Re: Who makes the most accurate and reliable mechanical oil pressure gauge ?
The difficulty in such a discussion re "accurate" gauges is the fact that most commonly available/purchased gauges are not calibrated and most people don't have any way to calibrate a gauge.
IOW, if your new gauge shows X pressure at Y RPM, how do you know that that is really the correct pressure. The answer is, you don't. Test gauges that are calibrated that can be used to provide really accurate readings cost around 1000 bucks. Fluke, as well as other manufacturers, make such gauges.
We normally assume that mechanical gauges are more "accurate." But, in reality, although they are not subject to variations in voltage/wiring/connection issues that can effect electrical gauges, the specific reading can still be substantially in error. OTOH, the RELATIVE readings of the mechanical gauge are likely to be consistent.Mike P
San Miguel de Allende, Mexico; Kent Island MD; San Antonio TX
1980 53MY "Brigadoon"
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09-30-2015 04:04 PM #10