![]() ![]() The capillary tube needs to be routed through the engine and dash carefully, avoiding any sharp bends or kinks. That means you don’t have to worry about matching the gauge to its correct sending unit either.Īnd since it doesn’t rely on electricity, it’ll still deliver an accurate reading after the ignition key is removed, which can be handy if you want to see how heat dissipates when the engine isn’t running.Ī mechanical temperature gauge can be pretty easy to install too, just thread the probe though the inside, then out to the engine bay, and screw it into a coolant port.īut at the same time, installation can also be a big drawback for a mechanical temperature gauge. There’s one main advantage to a mechanical gauge-it requires no electricity (save for an optional backlight so you can see it at night). Pros & Cons of a Mechanical Coolant Temperature Gauge Note the black capillary tube that’s permanently attached to the back and the metallic probe on the other end that threads into your engine. The tube connects to the gauge and, on the other end, it terminates in a threaded probe that installs into your engine’s water jacket or other cooling passage.Īs the engine heats up and cools down, the gas reacts, then the gauge’s internal mechanism interprets the changes in pressure to deliver a temperature reading. That tube contains a gas/fluid that expands and contracts as the temperature inside the tube changes. ![]() Look at the back of a mechanical temperature gauge and you’ll likely see a sealed tube permanently attached to the back of it. It’s based on a design called a “ Bourdon Gauge,” but we’ll skip a lengthy scientific discussion on how it all works and just give you the basics. (Image/OnAllCylinders)įor starters, a mechanical water temperature gauge is technically a pressure gauge that detects changes in pressure related to the way a gas reacts to temperature fluctuations. How Does a Mechanical Water Temperature Gauge Work? Here’s the mechanical gauge we’re testing in this demonstration-it’s a well-used unit from an old Summit Racing gauge kit that’s been installed in a handful of different projects and is still going strong. Sensor thread optionĢ.A little while ago, we quickly alluded to the difference between mechanical and electrical coolant temperature gauges in a post about troubleshooting a radiator.īut this topic deserves a little more attention and we also thought it’d be helpful to show you how to test your electrical and mechanical coolant temperature gauges too. 1x brand new button with the digital LED thermometer built inįor measuring coolant temperature you can place the M14x1.5 in the m20 engine block instead of a plug under rear exhaust header (see pictures).Does not require cutting or soldering wiring (easy to install/disconnect).Step-by-step assembly guide included in the kit.Simple and quick connection via included couplings.Always great to know when the engine is warm and you can floor your bimmer… and when to stop ) ![]() Useful coolant temperature indicator that fits perfectly in BMW E30, E24 or E28 console. Digital LED temperature gauge with BMW console button appearance. Cool accessory that every BMW E30, E24 and E28 fan should have. ![]()
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