My copper line has been on for 20 yrs. Do it one more time with copper and forget about it. Just my exsperience for what it's worth, I personally don't like anything but mechanical gages, my motor over heated on a trip and all the bearings got ruined(the mother of all knocks), it was under warranty but they put another short block in the car. The idiot light never came on.... that's why I put the mechanical water temp and oil pressure gages in to begin with.... a long time ago ....... good luck.
Chuck