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Old 05-23-2011, 03:00 AM
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3 oil pressure switches?

I need 3 oil pressure switches on my Chevy small block engine.
1 for an oil pressure warning light
1 for the oil pressure gauge
1 for electric fuel pump safety cut-off.

Where Do I mount them? Speedway Motors are selling a 1/8" NPT tee fitting that fits in the oil pressure switch location above the oil filter, but what about the third one?

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Old 05-23-2011, 03:30 AM
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port below the distributor is a good place.
thats where mines at
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Old 05-23-2011, 06:43 AM
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You can put a tee at any one of the ports to get two holes, or just wire a relay to one switch. Just ground the fuel pump relay to the oil pressure switch so the fuel pump comes on with oil pressure and use the other post on the relay for the oil pressure light.
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Old 05-23-2011, 06:46 AM
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Should be another plug on the front of the block just behind the water pump.
I put my oil pressure gauge line there because I like to see the pressure reading from the furthest point from the pump.
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Old 05-23-2011, 09:19 AM
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You don't need three switches. You can combine the oil idiot light and the fuel pump safety switch by using a Standard Motor Products PS64 sender. This sender has three terminals. The center terminal goes to the idiot light and the outer two terminals are connected together when there is oil pressure to run the fuel pump.

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Old 05-25-2011, 02:51 PM
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Thanks for the answers. Lots of good info as usual!

But maybe I don't need the oli pressure warning light, since I have the oil pressure safety switch for the fuel pump? What do you think?

To make any sence, the warning light must get on by a little higher pressure than the fuel pump safety switch will shut off the pump, right?

The safety switch I have bought will shut down the pump by an oil pressure below 7 psi.
The warning light kit i might buy have a 20 psi sending unit. Forgive me for this stupid question, but is this for warning the driver about too high oil pressure, or too low...?

The engine is a close to standard 350 small block chevy, by the way.
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Old 05-26-2011, 05:59 AM
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Just an update.
I found out about it. The standard "idiot lights" have an oil pressure switch that turn on the light when pressure goes below 20 psi.
The fuel pump safety swith that I already have bought, shuts down the pump when the pressure goes below 7 psi.

I will probably buy an "idiot light" kit. Those kits often have the needed tee coupler enclosed, too.
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Old 05-26-2011, 06:46 AM
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Quote:
Originally Posted by joe_padavano
You don't need three switches. You can combine the oil idiot light and the fuel pump safety switch by using a Standard Motor Products PS64 sender. This sender has three terminals. The center terminal goes to the idiot light and the outer two terminals are connected together when there is oil pressure to run the fuel pump.

Great tip!
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