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post #1 of 18 Old 07-03-2014 Thread Starter
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Gauges for Yanmar YSB-8?

I have a Yanmar YSB-8 engine on my 1977 CS27, which thankfully runs like a top. The engine panel, however, is in rough shape and due for a make-over.

As I understand it, the engine system has sensors for oil pressure, engine temperature, and voltage (off alternator). I'm wondering if the existing sensors can feed an analog gauge rather than the dummy lights they are currently connected to. If not, is there a moderately painless way to get this information in the right format? I am most interested in looking to have a temperature gauge and oil pressure gauge.

I also want to add a analog tachometer, but I believe that I have to have my alternator modified for a pickup before I can do this. (I don't like the look of the tiny-tach, which I think is my only alternative).

Would appreciate any guidance, as I don't have much information on how these work.

Thanks in advance,
Chris

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PYC, Lake Ontario

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post #2 of 18 Old 07-03-2014
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Re: Gauges for Yanmar YSB-8?

Generally the alarms use temperature and pressure switches, while gauges need sensors that vary in resistance. You would need to either add the sensors, or replace the switches with a unit that has both the switch and the variable resistance sensors built in. Most of the marine equipment vendors (West Marine, Defender, ect.) carry the sensors and gauges. Not too expensive - about $50 for a sensor/gauge set.
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post #3 of 18 Old 07-03-2014
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Re: Gauges for Yanmar YSB-8?

I just went down that road. I used faria gauges. about $20 each.
It's really not terribly difficult once one studies the way they hook up.
Amega gauge


sensors are pretty standard in resistant ratings.

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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post #4 of 18 Old 07-03-2014 Thread Starter
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Re: Gauges for Yanmar YSB-8?

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Originally Posted by deniseO30 View Post
I just went down that road. I used faria gauges. about $20 each.
It's really not terribly difficult once one studies the way they hook up.
Amega gauge

sensors are pretty standard in resistant ratings.
Did your boat originally have just dummy lights, which you converted to gauges without replacing sensors? Or did you have to replace the sensors?

I do like the look of those gauges - very nice!

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post #5 of 18 Old 07-03-2014 Thread Starter
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Re: Gauges for Yanmar YSB-8?

Just did some further research, and according to the Yanmar parts catalog, the oil pressure and engine temp senders are both switches, so they will not drive a gauge. This means I need to replace them with senders that will work on guages like Faria or Teleflex... Need to figure out how to find the correct after-market senders (I'm assuming the gauges are easy once I find the right senders...

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post #6 of 18 Old 07-04-2014
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Re: Gauges for Yanmar YSB-8?

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Just did some further research, and according to the Yanmar parts catalog, the oil pressure and engine temp senders are both switches, so they will not drive a gauge. This means I need to replace them with senders that will work on guages like Faria or Teleflex... Need to figure out how to find the correct after-market senders (I'm assuming the gauges are easy once I find the right senders...
So your research confirmed what I told you in my above post! Feel better?

You still want alarms, so don't replace the switches with senders (sensors). Either add senders or replace the switches with combination switches/senders. Again, what I said in my first post. If you check any marine retailer that sells the gauges, you will find the senders along with them. And most are standard, so you can usually mix and match brands.
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post #7 of 18 Old 07-04-2014 Thread Starter
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Re: Gauges for Yanmar YSB-8?

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So your research confirmed what I told you in my above post! Feel better?

You still want alarms, so don't replace the switches with senders (sensors). Either add senders or replace the switches with combination switches/senders. Again, what I said in my first post. If you check any marine retailer that sells the gauges, you will find the senders along with them. And most are standard, so you can usually mix and match brands.

Yes - I do feel better! You put me on the right track, but I still had to check it out. The thing that's making me nervous now is that I read a post somewhere indicating something about metric threads on a Yanmar block, so I'm trying to figure out whether I can buy one of the standard sensors with 1/8 size fitting, or if I need a special one, or some kind of an adapter.

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post #8 of 18 Old 07-04-2014
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Re: Gauges for Yanmar YSB-8?

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Yes - I do feel better! You put me on the right track, but I still had to check it out. The thing that's making me nervous now is that I read a post somewhere indicating something about metric threads on a Yanmar block, so I'm trying to figure out whether I can buy one of the standard sensors with 1/8 size fitting, or if I need a special one, or some kind of an adapter.
Good point about metric threads. Note that you can add a water temperature sensor many places in the water circuit with a tee. Just needs to be grounded to the block to complete the circuit. The oil pressure is tougher as you need to use that location. Not nearly as useful as the water temp however, so not a great loss if you decide its not worth it. Volts and fuel level are also more important than an oil pressure gauge.
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Re: Gauges for Yanmar YSB-8?

Thing is.. even "marine" sending units are pretty cheap.. for temp, oil, water, volts.

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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post #10 of 18 Old 07-05-2014
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Re: Gauges for Yanmar YSB-8?

I to want oil pressure water temp gauges. VDO makes
Metric pipe sending units but I have not removed my
fittings to try to match up the Yanmar threads.
Looking on in intreats.
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