Looking for a gas foot throtle kit for a 1921 touring sedan
There a few originals out there but not real common. The one shown above would get you up and going. It would work with the hand throttle. You might post a question on the forum asking for ideas to make your own. So people don't give you too much flack, there is no such thing as a touring sedan, it's ether a touring or a sedan, but not both.
The pedals alone I think are still fairly common, but all the linkage and slides are tough to come by. They can be made with a bit of creativity.