The ballast is not necessary if an MSD 6 or 7-series Ignition Control is being used with the points distributor.
Use with older points style ignitions
£11.87 £14.24 (£11.87 Exc. VAT)
MSD COIL BALLAST RESISTOR 0.8 OHM
For use with an MSD Blaster Coil when connected to a stock points ignition system.