Controlling pot from Arduino options.

Edited to include more information.

Basic aim of this project:
I have an RC vehicle that I want to be able to control both with it's paired remote and with some other device (This part is TBC and doesn't effect my query at this time.

Both the steering and throttle on the RC handset are basic 5K potentiometers. The idea I am researching now is to disconnect the potentiometers from the handset controller and connect them to an arduino housed within the handset.

In normal opperation the arduino would take these signals in from the potentiometers and then send the same signal back to the handset controller but in a secondary mode it would ignore the signals from the potentiometers and send it's own signals received wirelessly from this other controller that I haven't finalised designs on.

So my question is how to I use an Arduino to simulate the signal of a 5K potentiometer?

Should I look at getting a 5K digital potentiometer that can be controlled fron the Arduino or can the arduino itself simulate a potentiometer via PWM? Or is there some other option?

Thanks,

What is the specific question You want to be answered? I have no ready project to send You.

So right now the pot connects straight to the microcontroller in the RC unit.

I want to connect this pot to the arduino, i know how to do this.

How do I then connect the arduino so it can send the same signal that the pot does to the microcontroller in the RC unit?

What do You want the Arduino to do with the signal it will measure?
I suggest that You let the RC controller stay as it is but You tap the pot signal, GND and pot value, and connect them to the Arduino.

Sorry, my original post was written on my phone quickly, I have just sat down and edited my original post to include some more infomation on what i hope to acheive.

Thanks.