3 videos. 8 min, 1:45 min and 1:24 min sec to show strange overheating

66DartSedan said
I got

I got this gauge here, but lemme ask if the positive goes to the temp sensor, the negative to the dash as a ground what is the middle screw for..lost the instructionsView attachment 1715229815

What brand is it I will try to look up information on it online maybe able to find a pdf from the manufacturer