Oil pressure sending unit

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Assuming that you have actual oil pressure then it's probably the gauge stepper motor that's the issue. It likely needs replacement. The first few years of S197(2005-08 I believe) were known for poorly engineered gauge motors that failed. As I recall there was a TSB for it.
You have an S550 but a stepper motor can fail in any modern vehicle. Cluster repair services are out there that can change the motors. If you know which motor you need then you can change it yourself if you have the desoldering and soldering skills.
Here's one place that both sells the steppers and does repair:
Ford Cluster Repair - Tanin Auto Electronix
Gauge Cluster Stepper Motors for Sale | Tanin Auto Electronix
There are many cluster repair services out there and some sell the steppers too.
2x Mustang Steppers Motors Gauge Cluster Speedometer MR1107 X27589 XC5589 Type (vehiclemodule.com)

Well it's a 5.0 v8 engine all the other gauges work except the oil psi one just stays at 0 should I pull the cluster out to check the wires in the back and it's still under warranty from the dealer ship I was just hoping not to spend 125 for them to look at it the part only cost me 18 dollars the sensor but didn't fix the issue would it still be the cluster it self that is causing the problem with the oil psi?

I'm wondering if this cluster dashboard has stepper motors that is causing my oil psi gauge to not work

Tjraptor said:

Well it's a 5.0 v8 engine all the other gauges work except the oil psi one just stays at 0 should I pull the cluster out to check the wires in the back and it's still under warranty from the dealer ship I was just hoping not to spend 125 for them to look at it the part only cost me 18 dollars the sensor but didn't fix the issue would it still be the cluster it self that is causing the problem with the oil psi?
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From the pic you posted it looks like you have a full digital gauge setup. You don't have stepper motors unless you have actual moving needles.
The engine size won't matter. The rest of the gauges working have no bearing on an individual gauge not working unless all of them don't work in which case a main power supply issue or module would be a cause but this isn't the case here. Since your CEL or oil light isn't on the stepper motor would have been the likely problem if you had a physical needle moving but apparently the needles are virtual in your cluster. In this case I would say that the signal going from the sensor to the cluster or PCM is open(no or insufficient connection) or the cluster isn't displaying the oil pressure due to some internal malfunction.
If your car is still under warranty and the engine monitoring systems are covered then you'd be crazy not to take it to them to have it fixed for free. They'd probably replace the entire cluster if it was covered. A 2017 should be out of warranty or very close to the end if it was bought at the end of the 2017 model year. I don't know if the cluster is a part that falls under the 5 year powertrain warranty but an extended warranty would definitely cover it. You only have a 3 year bumper to bumper warranty which is definitely expired now.

It shpuld be covered I got it used and payed for the 5 year warranty so should be cover I'm waiting for the sells man to call me Monday. I tested the wire going to the plug on the sensor has 12v since the wire has power does it ran to the pcm then another wire from the pcm to the cluster? Maybe that wire is causing the problem taking the cluster doesn't look fun but I would like to test the wire going to the gauge for power

You'd need a wiring diagram to trace where it goes and to see the voltage or type or signal. Just because the sensor is getting 12v doesn't mean that voltage or signal is coming out of it and going to where it needs to go.
If you paid for an extended warranty then it's most likely covered. For your sake I hope it's an actual Ford brand warranty and not some 3rd party brand bought thru the Ford dealer or a used car dealer.

Tjraptor said:

I believe it is a off brand but I got the best plan to I might go to the auto parts store to get a book on the 2017 mustang I just hope the guy who had it before me didn't try to cut into the wire for a aftermarket gauge set up

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Yeah, well that really should have been mentioned in the beginning of this thread... That's kind of important information... After looking it up I can see that it's an aftermarket gauge cluster made by Infotainment. This wasted a lot of my time since if I had known that it would've eliminated the need for a lot of this conversation. You'll need to call them for any service on the cluster if it even exists. Your warranty almost definitely doesn't cover aftermarket equipment either.
You can't buy a Haynes manual for any Mustang after 2010 since that's when they stopped making them for the Mustang. Even then you won't find thorough/complete wiring diagrams in any Haynes manual for any year. Chilton manuals were the same. You need a 2017 Ford Mustang Service manual that includes complete wiring diagrams especially with modern cars.

So I call the company that makes theses aftermarket dashboard they told me for some reason on the 2017 ford mustang the oil pressure gauge doesn't not work and they don't know why I had to go buy a glowshift gauge and wire it in 350 dollars later cause I had to buy the battery voltage gauge and oil pressure gauge plus a side trim pod to put them in

Tjraptor said:

K but the dash came with the car when I got it I didn't buy it and install it. It was already there so hopefully they don't try to use that against me

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That generally would not matter. As far as any warranty is concerned, it is an aftermarket product and therefore would not be covered.
Regardless of who installed it or when

Tjraptor said:

So I call the company that makes theses aftermarket dashboard they told me for some reason on the 2017 ford mustang the oil pressure gauge doesn't not work and they don't know why I had to go buy a glowshift gauge and wire it in 350 dollars later cause I had to buy the battery voltage gauge and oil pressure gauge plus a side trim pod to put them in

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It sounds to me like the company that made the instrument cluster, Infotainment, is full of it with that excuse about only 2017 not having a working oil pressure gauge. Idk what that's supposed to mean either but they were clearly brushing you off. The 2015-17 instrument cluster and pretty much all the engine control and monitoring systems were completely unchanged.
With a full digital cluster either the sensor isn't working(you already swapped that out), the sensor wiring to the PCM or instrument cluster has an open/break in a wire or connector, or the cluster itself has a bad connection or an internal defect(most likely). If the sensor wiring routes thru the PCM before going to the instrument cluster then the PCM itself could be the issue but this would be rare.
I would have bought another identical instrument cluster and then returned the old one in the box. Then the manufacturer would have had no choice but to deal with it because the vendor would be getting reimbursed by them for the defect product.