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Old 01-27-2009, 08:35 AM
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low-only sensors

what are the "low only" sensors called for like the light that comes on when you have low oil pressure or the alternator is not charging.....and can you have an oil pressure gauge as well as the low pressure light on a chevy 350?
help me!

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Old 01-27-2009, 08:44 AM
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If the pressure sensing device drives a gauge, it is typically called a "sender" and if it only runs a light it is called an oil pressure switch.
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Old 01-27-2009, 09:14 AM
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ohh....words of wisdom.....thanks
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Old 01-27-2009, 11:11 AM
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i still need to know if you can have the pressure switch as well as the gauge....can i put a tee on the port to the driver side of the distributor?
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Old 01-27-2009, 11:28 AM
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Quote:
Originally Posted by usmcsawgunner
i still need to know if you can have the pressure switch as well as the gauge....can i put a tee on the port to the driver side of the distributor?
YEP, I do it all the time. Gauges and lights.

Fact of the matter is, with all the hype about gauges, 98% of the hot rod drivers will see a light before they ever see a suddenly low reading gauge.

My personal rigs all have lights and BEEPERS on the oil and alternator.
Pick up a $4 piezio buzzer (pulsating beeper actually= 1/2 inch think x 1 1/2 inch diameter) at Radio Shack and wire it in parallel with the light. Then you get red and pulsating beeper simultaneously. Saved me one engine when my son was driving. Damn hard to miss

added
OP switches come in 6 psi up to 20 psi values. So you can decide if you want a low warning or an "almost no" OP warning.
With a 20, you might be suprised how often you get a single blink and beep.

Last edited by ScoTFrenzel; 01-27-2009 at 11:35 AM.
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Old 01-27-2009, 08:02 PM
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Quote:
Originally Posted by ScoTFrenzel
With a 20, you might be suprised how often you get a single blink and beep.
When I lived in Phoenix and drove a Chrysler 300 w/440,
The temp and the oil lights came on all the time (flickering) when sitting at a traffic light in the summer.
Never had that problem in the winters --- or in Idaho where I pretty much grew up with the same car.

The "cold" light would only be on for about 60seconds in the summer in Phoenix-----be on a good 4-5 minutes in Idaho or Phoenix winters.
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Old 01-27-2009, 08:07 PM
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Many stationary engines use an "Hobbs Hour Meter" to determine run time for oil changes etc. The sending unit they use works well for lights or buzzers or both. The benefit is they are adjustable, you can set them for any pressure. And yes tee off at the oil fitting used for the gauge.
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