Speedhut Oil Pressure Switch

[hefavitzen]

Hey guys, I think I have blown out my oil pressure switch that came with my Speedhut gauges. In my efforts to find a replacement I had to turn to the Internet as neither O'Reillys and Advanced Auto were able to figure out where this thing came from.

But, here is what I believe the actual switch is: Dakota Digital SEN-03-8 - 0-100 psi switch with 1/8 npt threads.

From the pictures it is identical to my own, down to the offset notches cut into the nut - here they are side by side, old and new.



I have posted how to test one of these sensors further down this thread.

 

[Mancunian]

Hey guys, I think I have blown out my oil pressure switch that came with my Speedhut gauges. In my efforts to find a replacement I had to turn to the Internet as neither O'Reillys and Advanced Auto were able to figure out where this thing came from.

But, here is what I believe the actual switch is: Dakota Digital SEN-03-8 - 0-100 psi switch with 1/8 npt threads.

From the pictures it is identical to my own, down to the offset notches cut into the nut.

Sure it's the sensor?
Can you/have you checked the resistance? I must admit that i'm not sure what a digital sensor is.
But why not the Speedhut sensor? If it is, then isn't that a lifetime warranty?

Pressure Sensor - 100 psi

Pressure Sensor - 100 psiwith Lifetime Warranty | Custom Build Your Gauge

speedhut.com

 

[hefavitzen]

Sure it's the sensor?
Can you/have you checked the resistance? I must admit that i'm not sure what a digital sensor is.
But why not the Speedhut sensor? If it is, then isn't that a lifetime warranty?

Pressure Sensor - 100 psi

Pressure Sensor - 100 psiwith Lifetime Warranty | Custom Build Your Gauge

speedhut.com

You are not crazy, I am just not very good with a multi meter. I did attempt to check resistance and I don't trust my outcome at all. Call this the price of inexperience and I'll learn from this go around.

As for the lifetime warranty, I didn't even think of that! I'll look into it. Thanks for the reminder.

 

[hefavitzen]

Here is how to determine if your Dakota Digital or likely any 100psi 3-prong oil pressure sensor is bad.

I contacted Dakota Digital tech support and here is what they said:

It is a 5 volt sensor between the red and black wire, the white wire is the voltage return. 0 psi it should return about an half a volt on the white wire and 4.5 volts at 100 psi. If the ground is missing it will read about 3.5-3.8 volts just with key on engine not running.



Sam Hoffart, Technical Support, Dakota Digital, Inc, Email: SamH@dakotadigital.com, www.dakotadigital.com

I was nervous about testing the sensor under power because this meant I would have to at least poke a multi-meter lead into the wire casing. I said as much to Sam and he said, "That is exactly what you'll have to do.", so I did. (Sam was very helpful, actually answering 4 or 5 emails from me throughout the day.)

Here is the old sensor and it's reading with the multi-meter. I am touching the white wire with one lead and the other grounded on the block.
It reads 4.95 - or with the key on and the sensor out of the engine it is reading 100psi. Not Good.

So, here is the new sensor attached to the wiring. It reads .531 or 0psi -
This is Good!


Now with the engine running it reads 40psi. Much better.

Also, Sam was interested in hearing more about Speedhut using a Dakota Digital sensor in their kit. I explained I was probably customer #1 or #2 for this kit and today they apparently sell their own sensor because this specific sensor isn't available on their site (had to hit up Summit).

 

[Mancunian]

Good deal!