17 - 123 Electronic Ignition G100SD1

High-tech ignition system concealed in distributor-like case. Includes latest Hall-effect technology with micro-processor that adjusts dwell angle throughout rev range for peak energy and performance. Available in two specifications, set up for early distributor drive gear (as found in the MGB GT V8 engine) or late distributor drive gear (as found in Rover SD1 engines and later).