Dual guages off Engine Temp Sensor???

John T1594 · Mar 13, 2015

Digital Temp Guage

Several years ago I installed a CruzPro T30 digital temperature gauge with alarm on my 2000 H340 with the Yanmar 3GM30F engine. I replaced the original engine temperature sender with a Telflex 3/8” sensor. The alarm on the CruzPro was set at 190F. I used the original blue/white wire from the old engine sensor to the new gauge in the pedestal. The ground for the gauge was tapped into a common ground wire on the fuel gauge and the Positive wire was tapped into the Positive lead on the ignition switch. The gauge worked great and was calibrated for the Telflex sensor (U-4). I have used it for several years now and it gives me good continuous reading of the engine temperature. This installation avoids the problems with dual sensors, T-fittings, etc. and gives me accurate engine temperature readings with the protection of an over-temp alarm.

woodster · Mar 13, 2015

yanmar does make a dual panel system so you can have a panel in the cockpit and at the nav station ...but hold on to your socks as its not cheap....or you can add a temp sensor on to your system and a gauge and have both for about 60 bucks or so

Benny17441 · Mar 13, 2015

Jon your current sensor is just an On/Off switch set to go at a specific temperature. What you need is a graduated sensor that will send a calibrated signal to the gauge so it can indicate actual coolant temperature. Many have successfully used automotive sensors and gauges by T-ing off the OEM sensor. It is important to retain the idiot light and alarm buzzer as we are seldom looking at any gauges.

seadaddler · Mar 13, 2015

Be careful

I will tell you I did the tee thing years ago and they worked great for about
a year or so until one day one of the brass tee's cracked and it was the oil
sender that cracked and good thing the oil gauge was at the helm and saw it before ruining my yanmar engine but the oil leaked all over.
I just added a temp sender and gauge to my 3YM30,no tee.
I will look for the photo for the install or look in the search on this forum.
Nick

joker460 · Mar 13, 2015

If you do a search on Sailboatowners.com you'll find a lot on this topic.

If you have a water heater with your 3GM30 you could install a temp sender like I did. This would leave the exisiting buzzer sender in tack.

seadaddler · Mar 13, 2015

photo

Here we go.
nick

John T1594 · Mar 14, 2015

Digital is the way to go

Forget the T fitting that breaks after a year; forget trying to spiice a sensor elsewhere into the coolant circuit - just get a digital gauge with a single variable sensor that screws into the same place as the old sensor! It tells you the exact engine temp AND it has an adjustable alarm setting for engine overheat - the best of two worlds at half the trouble.

Benny17441 · Mar 14, 2015

John T1594 said:
Forget the T fitting that breaks after a year; forget trying to spiice a sensor elsewhere into the coolant circuit - just get a digital gauge with a single variable sensor that screws into the same place as the old sensor! It tells you the exact engine temp AND it has an adjustable alarm setting for engine overheat - the best of two worlds at half the trouble.

John T, now you have my interest. The purpose of the OEM buzzer is to draw your attention while the idiot light will indicate the ailing system. If that digital gauge has an alarm loud enough to get my attention under normal cockpit conditions, I'm sold subject to reasonable pricing of course. It may seem you may have come up with a solution to a long standing problem. If you can provide any specific brand that can do the job or the name of a vendor that would be super. Thanks.

woodster · Mar 14, 2015

if seawater is NOT going through them brass will work
some of the fittings on a brand new yanmar are brass

joker460 · Mar 14, 2015

Here is a thread on using Digital Gauges. http://forums.sbo.sailboatowners.com/showthread.php?t=126646

The reason I went with my install was to connect the sensor to a NMEA2000 Engine Module so that information is displayed on my Chart Plotter.

Information: http://www.cruzpro.com/

seadaddler · Mar 15, 2015

Great

That cruz pro sounds good but I already had the temp gauge
and got a temp sender and I added the sender in the heater hose
and had room for gauge at engine panel in cockpit.
I just look at the gauge and still have warning buzzer hooked up.
Nick
Nick

Bill Roosa · Mar 15, 2015

NEMA 0183 is a single talker, multi listener protocol. Only one "sender" can talk on any one circuit. Lots of listeners but only one talker. That is not to say that you can't do it, but you will get LOTS of data collisions which will probably leave you wanting a second NEMA 0183 port for every other talker. The other alternative is a multiplexer which has many listening ports (one for each talker) and one re-talker port. this will be a manufacturer specific solution as you will be connecting the "listener" (SeaTalk, NEMA 2000 and other protocols don't actually work like that but to keep the lexicon consistent) device to the manufacturer's proprietary protocol port

John T1594 · Mar 15, 2015

CruzPro T30 Digital Temp Gauge

I installed the Cruzpro T30 digital temp gauge back in 2006 and it has perfomed flawlessly since then. The overtemp alarm setting is variable and I set mine at 190 F to have some advance warning of an engine running a bit too hot. The only time it has gone off is when I changed the coolant a few years ago and had an airlock in the system with a temporary overheat. The digital gauge is so sensitive that I can tell when I have some eel grass in my raw water strainer as I get a slight increase in my normal operating temp. The curent model for the CruzPro temp gauge is their T60. See: http://www.cruzpro.com/t60.html

The installation was easy. As I mentioned, I even used the original Yanmar wire from the old engine temp sensor that went to the idiot light on my panel.

The CruzPro owners manual is attached.

Dual guages off Engine Temp Sensor???

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