I wanna run a speedometer from a reluctor tooth wheel on the cv joint.

Does anyone know or have done this in the past ?

CV joint trigger wheel

ya but im unsure of how they work or what all is needed. . .
new territory im treading into here

i know obviously a sending unit of some sort to pickup from the CV wheel, a speedometer of sort, and some sort of box to receive the signal, unless speedos come with this built in ?

Depends on the speedometer, you need to pick the speedometer.

Usually 2 methods, VR (variable reluctor, sine wave) or Hall Effect (digital square wave)

I used a VR sensor off of EG33 Subaru engine(just because I had one handy) and used it to count the 6 allen bolts on my CV Joint. This worked real good with the Stack dash I'm using.
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Or you could use something like this.

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This is what I bought to use with my Vehicle speed sensor on my LS conversion. Same principal Prowlers here in Santa Clarita made mine.