My current project is a 49 Chevy 3100. I have verified that the temperature gauge, and lead works, and want to keep the original gauges. With the engine transplant the lead now comes up short by about 1'. Is there a way to lengthen the copper lead?, I've asked some local guys, and have recieved mixed answers, one saying there is a gas inside the lead so it can't be cut. Any help would be appreciated.