Where is the Port? Plug located for the use of a Code Scan tool on a 1991 Town C on 1991 Lincoln Town Car

Want to check for any codes /other issues with a scan tool; Just got car / Not able to find the connector for a scan tool

Asked by for the 1991 Lincoln Town Car
Under the hood on drivers side best I can remember.... but unless you have an (OBD 1) 'scan tool' it will not do you any good!!
Thank-You ;First time user ; Is that the system you use a test light under the hood ?