Welcome to the forum OutdoorJoeM. I have never heard of a oil temperature gauge for a gold wind, as it is a liquid cooled engine there would be no need for one. In any event if you have found one, hooking it up to the oil pressure warning light sending unit will do no good and could damage your sending unit. It is sensing pressure not temperature. Could you describe the temp gauge you have?
Jack i took a closer look the gage it looks like a after market gage the name of the gage is Autometer one wire is + one is - and look like it is for a sender. what gage is under the radio. i guess this gage does not belong on the bike.