I must be missing something, as it appeared to me, that I can't get into the gauge unit to tighten the studs? On my 66 satellite I started every one of those pens for that round connector for the instrument cluster this applied to power and did the little fivev solid-state upgrade.. back when one Radio Shack in town at least old something even though the people that work there get go how to do anything but cell phones but I managed to find what I needed