Simple voltage follower
The question you are asking is very easy to answer. In order to make a voltage follower, you need a single opamp connected in "voltage follower" configuration.



Yous hould have a 5V line available for your TPS, you can use it to power the opamp. Make sure you use a rail-to-rail opamp so that you can go as low as 0.2V.

You will most likely need 2 opamp as most throttle pedal have 2 output for redundancy.

Last thing, what is the resistance of your pedal ? And what is the input impedance of your computer analog input ?   Maybe there's another solution than buffering the signal.

Good luck