would a coolant pressure gauge be useful? Update: YES!

[Maengelito]

since the cap regulates the pressure, i dont think a coolant pressure gauge would do much except tell you the rating of the cap. also, if you had a leak, a coolant pressure gauge wouldnt tell you if it was in a line or the headgasket or where. it'd just show that the pressure was down. obviously, its not gonna hurt to monitor the status of coolant, but i dont think it would be of much value