Door Bell Wiring Diagram - THE ERA GT KIT AN UNASSEMBLED PRODUCTION CAR. $54,900. ERA REPLICA AUTOMOBILES has long been known for the highest quality in design, engineering, and craftmenship. In replica circles, the ERA 427SC (and now 289FIA) have become the standard by which others are judged.In fourteen of the last fifteen years, customer built ERAs have been voted the "BEST COBRA REPLICA" at the. Water Level Indicator Description . This is the circuit diagram of a simple corrosion free water level indicator for home and industries. In fact, the level of any conductive non-corrosive liquids can be measured using this circuit..