My motor did not come with a water pressure gauge on my 2000 Ranger R81. I put a jack plate on it and want to see the water pressure. Have the gauge but want to make sure I install the lone correctly. There's a plug on the top of the port and starboard cylinder banks. Is that where a fitting would go and then run the line? Seen some mention the tell-tale line but that didn't sound right. Please let me know. Thanks!