I just got through doing a bunch of work on the 68 and on the way home from the shop, I lost my turn signals and speedometer. I have the Covan Cluster with all electric gauges. I had taken the gas tank out to replace the shackles/shocks and had to cut the ground wire on the fuel sender because I could not get the wire disconnected. the old wire broke off and I just drilled a small hole in the ground paddle and used a small sheet metal screw and round connector to wire up the ground. The only other wire that I disconnected was the signal wire from the sender, but I snapped it back on before the tank went back in. the gauges are new (less than 200 miles on the whole setup). I test drove it about ten miles after everything went back in and all of the gauges worked fine. But when I left to come home the problems started. My headlights and brakelights work. My turn signals fail at the cluster and the bulb(both sides). When I depress the brake and turn on a signal, the brake light on the respective side goes out. So, if I've got the brake pressed and seeing red, when I turn on the left signal, the left rear light goes out and the right stays on and visa versa. Could it be the fuel sender signal wire...maybe it didn't get popped in all the way or is it something else? How can I check the ground that far back on the car?...there's no powered wire I can reach with my test light.