Here is the explanation of all of those levers and gauges inside the Red Mule. First the best overall picture I could come up with.
And now I will show a picture of each item and an explanation, starting with the hand throttle.
As stated previously in this thread, the hand throttle has several uses. I use it on long trips to rest my leg and ankle. It can also be used as a manual cruise control, except works just the opposite of a regular cruise control. You can back off the throttle going up hills in order to get better MPG and increase the speed down hill to build momentum when gravity is helping you save gas.
If you practice using it to make throttle adjustments, I have found my hand can be more precise than my foot.
The hand throttle is all hand made from 3/8" all thread and 3/8" thread couplers, fender washers, and nuts. The panel that supports the lever is made from 0.090 inch aluminum sheet.
This was version # one and I don't recommend coping it, as far as the connection to the throttle. It was way too complicated as I was trying to make sure it did not get bound up and stuck in WOT
Here is the second version made from a lever and rod we bought from Speedway Motors, It is much simpler. It is installed in my brothers 94 VX.
