I don’t know of any, but how about adapting one of the electrically assisted steering boxes that many cars have now, in place of the hydraulic type of old. Should be a lot less problem than trying to power hydraulics on a kart!

most modern electric power steering is just an electrically-powered hydraulic pump.

I know that some Super Kart chassis uses front A-Arms for suspension adjustment, this is in addition to rack-and-pinion steering.  That would likely be a good start.  The rack and hydraulics could be sourced from a power-assist, or hydraulic steering rack from a lawn mower.

Here is a kart that was for sale that had an electric power steering setup.

Unisteer?  from a Honda ATV??

https://new.ekartingnews.com/forums/topic/crf-450-kart-package/

http://i1218.photobucket.com/albums/dd420/banned13/GO%20KART/GO%20KARTS%20FOR%20SALE/DSC02015_zps0781c1a7.jpg~original

link to a larger picture where you can see the PS setup on the steering shaft and the supporting brackets/electronics.

Good for you Ricky! Shifters are a blast.

Keep us updated, i’m interested in how you set everything up!