Have three different types of Muto digital indicators, each of which requires different power and output plug. One has common-looking pin-i-cylinder socket, think I’ll find a plug easily. Other two I need help-one is flat with 5 contacts, other is round with 6. Round one’s only about 3/8” dia., flat one around 1/2 x 1/8”, but I didn’t measure either. Anyone know what voltage dc needed to run them? Where can I get plugs?