A marine pyrometer is a useful tool in monitoring the health of a turbocharger. Two diesel pyrometer gauges should be used; one measuring the exhaust gas temperature from the engine, before it enters the turbocharger turbine section. Eventually I purchased a commercial Pryometer for my forge(s), but found them to be VERY expensive, with relatively short life spans. After experimenting with various parts, I stumbled upon a way to build a very economical forge pyrometer that is easy to build, and long lasting. This gauge is manufactured with an “air-core” internal meter that uses no physical contact with the pointer. Your car temperature gauge seems straightforward: a needle that shows you whether your engine is hot or cold, with a “safe zone” of temperatures in between. This feature should be ignored. The original infrared pyrometers were non-contacting optical devices which intercepted and evaluated the visible radiation emitted by glowing objects. Until microchips and compact electronic equipment became popular in the 1980s, a manual optical pyrometer was what you used if you wanted to measure the temperature of something extremely hot and relatively inaccessible, such as the inside of a steel furnace or a pottery kiln. There are laser pyrometers that measure heat at the outside of the tire, and there are probe style pyrometers that you poke into the tire’s rubber to measure the temperature inside the tires. No rhyme or reason to any of it. Today Bobtailing it would stay on 3, and once when I went up a hill it went up to 7.5. It has now quit completely and I was hoping that there is a way to test both the gauge and the sensor. The other should be placed after the gases have passed through the turbine and these two temperatures are used to monitor the health of the turbocharger. The term pyrometer was originally used to denote a device capable of measuring temperatures of objects above incandescence, objects bright to the human eye. Gauge goes from 0 - … The pyrometer does not have an active LOW warning, even thought it has a LOW warning set point. A boost gauge displays the turbo’s boost pressure so you can check whether the turbo is working correctly. Stopped to check everything out and all was fine but the gauge continued to read really low and then normal. Another possible issue is overboost, which, if left unchecked, could result in major engine damage. For instance, if the gauge shows the turbo isn’t boosting as it should, this could indicate a possible boost leak. PYROMETER Optical pyrometers. Hey everybody. A tire pyrometer is simply a tool that measures the temperature of a tire. Can anyone explain what a pyrometer is, how it works, and what is a good range. BOOST GAUGE. 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