I think I have shorted something or grounded something behind my dash of my 68 350. The engine kicks over and seems to start, but dies immediately after the key is released. Also, the tach does not move when the engine is crancked. I know the engine will not run if the tach is broken (been through that) so I took the two tach connection wires and connected them to each other, taking the actual tach gauge out of the loop. No change. Any hints? Carp