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Old 08-15-2005, 05:21 PM   #1
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Mechanical gauges, sending unit?

Is there a sending unit for mechanical gauges? Or is that only electrical? Can someone explain this to me?

-Ryan


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Old 08-15-2005, 08:33 PM   #2
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Yes, what exact guages are you talking about? Boost? Oil Pressure?
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Old 08-15-2005, 08:53 PM   #3
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Re: Mechanical gauges, sending unit?

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Originally posted by OneAMRadio
Is there a sending unit for mechanical gauges? Or is that only electrical? Can someone explain this to me?

-Ryan
No, there is not any "sending unit" per se for mechanical gauges, but of course there are fittings or connections that need to be installed or made.

The obvious example is an oil pressure gauge.

A mechanical oil pressure gauge has a small tube (bourdon tube) that connects into the oil delivery system. The gauge itself has a diaphragm that connects to the indicating assembly through the appropriate gear drive. When the oil pressure rises or falls, the pressure inside the bourdon tube rises and falls; this pressure deflects the diaphragm which drives the gears which deflects the needle.

An electric oil guage, on the other hand, is basically an ammeter (or voltmeter), depending on the system. The "sending unit" it basically has an internal diaphragm with a variable resistance. The proper electrical term for a "sending unit" is a "transducer", which changes a mechanical property (pressure, temperature, etc.) into an electrical signal. A change in oil pressure registers as a change in resistance; this will increase the current flow to ground which the gauge (ie. ammeter) or a voltage change (voltmeter) registers as a change in pressure.

The advantage of the electrical gauge is obvious -- a bourdon tube brings engine oil into the passenger compartment; it is a "weak link" where should the tube break or come loose you will have oil squirting out into the passenger or engine compartment. However, they tend to be more expensive, because of both the extra complexity (transducer, etc) and the fact that it's more desireable (ie price gouge).
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Old 08-16-2005, 10:19 AM   #4
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Thanks for the info. I'm geting a vacuum (mechanical) gauge, an oil pressure gauge (mechanical) and a voltage gauge (Obviously electrical).

-Ryan
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Old 08-16-2005, 01:15 PM   #5
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I need some help, with the oil pressure guage, where on a 2.0L Duratec does it go?

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