I do not trust idiot lights for my 2210's water temperature, oil pressure, and voltage monitoring. So.... I decided to install a water temperature gauge, but then found an Auto Meter 2391 kit ($66) that included all three. I chose 1 1/2" diameter gauges because mounting space in the dash is limited. I chose electric rather than mechanical gauges. Electric gauges do cost a little more, but I just do not feel safe relying on plastic tubing on an engine. I chose an Autometer 2391 kit that has all three electric gauges and three SAE adapters you will just throw away. Because................ The Yanmar engine uses METRIC fittings so I ordered a Sunpro CP7573 5 piece adapter kit for $7. The kit has a M16 to 1/8" adapter for the temperature sensor and a M10 to 1/8" NPT for the oil pressure gauge. Both the water temperature and oil pressure sensors require 1/8" SAE npt fittings.
The gauges are flush mounted in the dash. A 1 5/8" hole is required for a gauge, plus about 1/8" for the rings on the front of the gauge. The water temperature gauge is located next to the PTO switch. The voltmeter and oil pressure gauges are above the steering column. I had to cut off some length off the mounting screws for these two gauges. This is because there is not enough depth in this particular location. The is plenty of rear space for gauges next to the PTO switch. I would try to put two gauges here rather than above the steering column. Hind sight is always 20/20.
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1.) Installation of the voltmeter just requires a connection to battery and ground. Very simple to install.
2.) Installation of the water temperature gauge requires removing an M16 plug on the water pump housing and replacing it with a M16 to 1/8" NPT adapter.
The first picture shows my 2210 with the existing sensor switch on left and M16 plug on right. My 455 GT has the same arrangement except it came with both a temperature switch and temperature gauge. The switch is a fail safe to turn the tractor OFF when it overheats. Seems like most Yanmar engines will have the temperature switch with the temperature gauge optional. This means there is a M16 plug for the gauge and the switch for an idiot light will still work. The adapter and sensor are installed on the right side.
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[3.) Installation of the oil pressure gauge is a real PITA.
Option 1.) Replace the existing oil pressure switch that lights the idiot light with the pressure sensor. The idiot light no longer works.
Option 2.) Install a pipe tee so that both the idiot light AND the pressure gauge will be functional. I decided on option 2.
Now this is where it hit the fan. The existing oil pressure switch screwed into the engine block is a metric M10 fitting. The Sunpro metric kit also included a M10 to SAE 1/8" adapter. So I be happy. Yanmar is a Japanese company that uses the Japanese Industrial Standard (JIS) which is the same as the British metric standard. The standard has two types of threads which are the British Standard Pipe Parallel (BSPP) and the British Standard Pipe Tapered (BSPT). These thread forms are similar to the Dryseal American Standard Taper Pipe Thread (NPTF) and American Standard Straight Pipe Thread for Mechanical Joints (NPSM).
The tapered thread uses the threads to provide a seal. While a parallel thread will have some means of sealing at the top of the thread, either by O-ring, metal seal, or possibly by a machined ring in the hex itself. The metric adapter that I received in the kit was a BSPP parallel male 28 tpi thread to 1/8" 27 tpi npt thread, but the existing oil pressure switch was a BSPT tapered 28 tpi fitting. You can ALMOST get your hand to install the fitting. I spent an hour before I gave up and figured out I had the wrong adapter fitting.
I have googled everything I can imagine, but have not found the correct adapter. I will probably just cut off the existing male on the existing pressure switch and braze it the adapter.
I just found the adapter. here is the source. http://www.summitracing.com/parts/ATM-2269/