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The following is MY OWN OPINION and it should not be taken as such. Also, discussion is encouraged. There is no need to be plumbing mechanical pressure gauges for liquids into the cabin this day and age. Especially when it comes to Oil at up to 90PSI and fuel. Gauges of various accuracy can be used and there is no need to break the bank for an expensive band name gauge for most applications. You don't need to know that your oil pressure is exactly 80psi. Really you just need to know you have it and that it is in normal range (20-80psi) so a $30 single wire gauge and sender off ebay will usually fit the bill. Example: http://www.ebay.com/itm/2-52mm-SMOKE-TINTED-LEN-LED-ELECTRICAL-PSI-OIL-PRESSURE-GAUGE-52mm-BLACK-POD-/261181021181?pt=Motors_Car_Truck_Parts_Accessories&hash=item3ccf9a1bfd&vxp=mtr (disclaimer - the Dragon gauges are pretty dodgy. They work, but they are not "high quality") Fuel is a bit more critical, Especially for fuel injection. So the more accurate 3 wire transducer and suitable gauge will fit the bill nicely. Example: http://www.ebay.com/itm/Pressure-Gauge-30-psi-2-1-16-52mm-transducer-boost-analog-input-LED-/261009679317?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item3cc563a3d5 http://www.ebay.com/itm/Pressure-transducer-sender-30-psi-oil-fuel-air-/260785454553?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item3cb8063dd9 Unless you have a reason not to, you should always get a gauge that will give maximum resolution for the pressure you are measuring. What that means is, If your measuring 6psi. You would get a gauge with a 0-10psi range. If your measuring oil pressure (20-80psi) then a 0-100PSi gauge is what your after. Some more info on gauges: http://www.ozfalcon.com.au/index.php?/topic/2066-gauges-how-to-gauges-how-to/
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