Hello! Thank you everyone for all the great information on this thread! Helped me mod a servo tester for my set up.
Would these work instead of modifying a servo tester?
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F112551443926
Or this one...