Correct, I fallowed the12 gauge wire back to the panel and it had no other junction boxes. 20ft of wire from electrical box to breaker.
You are right because I can’t center the outlet and drill a hole in a blank cover plate because I will not have the screw in points for the outlet on the the electrical box
K, if you abandon the rest in line, dedicated it is. You could also buy a split duplex receptacle, power one side fill the box with another duplex dummy (not connected) kinda backwoods but so is modifying a cover plate.
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I vote best answer.
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And they are in Stock…https://www.kyleswitchplates.com/combo-duplex-outlet-single-1-62-20a-round-receptacle-cover-plate/ If you have seperate circuits, one for the duplex and another for the single, this would be the way to go and still have use of the duplex receptacle. 
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Good source to know about. Thanks for posting Larry.
Yes, definitely. Good find Larry
What is wrong with a single gang plate?
https://www.amazon.com/Leviton-84004-40-1-406-Inch-Receptacle-Wallplate/dp/B000FKDMDM/ref=pd_cp_60_4/137-9998017-1167435?_encoding=UTF8&pd_rd_i=B000FKDMDM&pd_rd_r=bc3be738-8e2c-4b96-97f2-035bef2837c7&pd_rd_w=TJoMS&pd_rd_wg=3PqdG&pf_rd_p=d534d65f-a237-49e4-9070-a58a3a6b8ba4&pf_rd_r=C4STXMNNVETX2M1M76HE&psc=1&refRID=C4STXMNNVETX2M1M76HE
Greg has a 2-gang box in the wall, from what I understand.
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I thought it was the other way around. Then what Larry M. posted would be the way to go.
I appreciate the guidance from everyone, very helpful.
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Yup, that would be the way to go, if he leaves the duplex receptacle dead.
Otherwise, what Rob posted is for the real dedicated circuit, with what Greg has existing:
You are correct! What Rob posted is actually what I need, the picture Larry posted could be used but only if I leave the outlet dead! That is correct thank you
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Remember that if you are using an existing circuit, you would need to disconnect all of the upstream and downstream receptacles to meet the manufacturer’s requirement of a dedicated receptacle. This could leave a lot of non-functional receptacles leftover from the old circuit depending on how many receptacles currently share the circuit.
Yes you are right, This box I am working on is all that came off of the circuit breaker. I fallowed the wire from the breaker to the electrical box and there were no other junction boxes and the wire dead ends into the box I am going to install the 20 amp receptacle. It is weird that it was the only outlet coming off of this breaker, but that was the case.
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Do not know how you followed a cable in a wall assembly but so be it.
It, the circuit, would be traced to first point of termination upstream.
Manufacturers requires a dedicated circuit and disconnect. Tanning bed.
Long string for this type of question.
I fallowed the wire down a floor joist then it dropped into a hallow core of cinder block, it was actually very simple to fallow, yes I got lucky with this one
Yeah you’ll need a Double gang and a single receptacle plate.
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Assuming an individual branch circuit.
You can install a single 15 on:
Branch Circuit, General-Purpose. A branch circuit that
supplies two or more receptacles or outlets for lighting and
appliances.
Mike what am I missing? The last two on my list could be general purpose branch circuits.