Different Types of Gauges and Explanations of Their Purpose. - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 27 (permalink) Old 03-04-2010, 01:17 PM Thread Starter
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Different Types of Gauges and Explanations of Their Purpose.

Voltmeter-A voltmeter measures the amount of voltage coming from the cars electrical system. It is installed by connecting a wire to a postive source and the other wire to a negative source or ground. Usually the easiest and simplest gauge to install. Proper readings are from 12-14 volts.


Ammeter or Amp meter-Another gauge that measures automotive electrical systems. This measures how many amps the car uses while the alternator puts back into the battery. It is properly installed by splicing into the starter wire usually using heavy gauge wiring. It is usually not as safe or reliable as a voltmeter and much more complicated to install. A good reading is 0. The alternator should put the same amount of amps into your car is your car uses.


Vacuum/Boost Gauge-A boost gauge is a pressure gauge that indicates manifold air pressure or turbocharger or supercharger boost pressure in an internal combustion engine. To install you must tap into a vacuum line and install a T fitting to run a line to the gauge. Normal readings at idle are 30-20. Normal readings accelerating can be from 20-0 (0 being full throttle on a normally aspirated engine). If you go above 0 that means you are making boost which is only obtained by a turbo, supercharger, or nitrous. That number can range from 1 psi or boost to as much as the engine is capable of making.


Exhaust Gas Temperature Gauge- An EGT gauge measures exhaust gas temperature. This reading is directly related to the internal combustion temperature of the engine, and indirectly related to the quality of the air/fuel mixture entering the engine. While other gauges can give an indirect indication, only an EGT can give a direct indication that the engine is operating correctly. EGT gauges consist of a high-temperature thermocouple (usually K-type) attached to a analog or digital readout. A hole is drilled into the chosen measurement location - exhaust manifold, oxygen sensor housing, or downpipe. The thermocouple is placed inside using air-tight compression fittings.


Coolant Temperature Gauge-A coolant gauge measures the temperature of the engines cooling system. A good reading is usually anywhere from 180-210 degrees Fahrenheit. Any hotter than 211 degrees Fahrenheit, the water in the cars coolant system could potentially boil. Most all cars nowadays come from the factory with a coolant gauge. Usually though a factory gauge just starts cold and moves to a normal operating position but gives you no exact numbers. Aftermarket gauges give you a more exact readout. Cobalts however have a digital display which gives an exact number. There are two ways to install an aftermarket coolant gauge. Mechanical installation involves taking a probe attached to the gauge and putting into the coolant usually somewhere near the radiator. (different on all cars). An electrical installation involves taking a sensor wire from the gauge and splicing into the electrical sensor that is stock so you get a signal. (again, different on all cars).





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post #2 of 27 (permalink) Old 03-04-2010, 01:39 PM
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nice write up so far in for more explanations!!!


2006 Cobalt SS/NA slightly modded but more to come
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post #3 of 27 (permalink) Old 03-04-2010, 04:00 PM
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good idea to do this - thanks.
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post #4 of 27 (permalink) Old 03-04-2010, 04:11 PM
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post #5 of 27 (permalink) Old 03-04-2010, 04:26 PM
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Since we were talking about it camo you can just copy this one



Exhaust Gas Temperature Gauge- An EGT gauge measures exhaust gas temperature. This reading is directly related to the internal combustion temperature of the engine, and indirectly related to the quality of the air/fuel mixture entering the engine. While other gauges can give an indirect indication, only an EGT can give a direct indication that the engine is operating correctly. EGT gauges consist of a high-temperature thermocouple (usually K-type) attached to a analog or digital readout. A hole is drilled into the chosen measurement location - exhaust manifold, oxygen sensor housing, or downpipe. The thermocouple is placed inside using air-tight compression fittings.


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post #6 of 27 (permalink) Old 03-04-2010, 04:27 PM
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added! thanks golfin
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post #7 of 27 (permalink) Old 03-04-2010, 04:29 PM
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i changed up the picutre G so if you wanna change it so it isnt so big you can do that

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post #8 of 27 (permalink) Old 03-04-2010, 04:30 PM
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I was hoping we could get a smaller picture lol
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post #9 of 27 (permalink) Old 03-04-2010, 04:31 PM
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Quote:
Originally Posted by gCobalt05 View Post
I was hoping we could get a smaller picture lol
again im just ninja awesome

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post #10 of 27 (permalink) Old 03-04-2010, 04:40 PM Thread Starter
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yeah I'll do trans temp, oil pressure and temp, tach, afr then




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