I bought a tach that i hooked up on a 70 chevelle malibu but the wire (green) that needs to be hooked up to the distributor doesnt have a slot for it..my tach comes with an inductive reader to be hooked up on the spark plug wires but when i rev the car it lags a bit..wat can i do to fix this or where can i hook up the other wire(green) to the distributor?