Which ignition coil is best to use with your 123ignition strongly depends on which engine you have:

- With a Citroen 2cv: DO NOT use other ignition coils than the standard (black) ignition coil. The manufacturer recommends that you immediately purchase a new black 2CV ignition coil and new silicone ignition cables with your new 123ignition. The brown VISA coil will damage your 123ignition due to the very low primary resistance.

- With the 2 cylinder DAF or FIAT engines you can continue to use the used ignition coil or another coil with approximately 3 Ohm primary resistance. We recommend the 123 Blue Coil. With 4 cylinder engines you can use the original coil or another coil with a primary resistance of at least 1.0 Ohm. For normally used cars we advise you to use the 123 Blue Coil. It may be better to use a 123 Red Coil for a rally car or other application where high revs are often driven. However, this last coil cannot be used if you want to drive with contact points.

- For 6-cylinder engines, we recommend that you replace your ignition coil with a so-called 'high performance' ignition coil because of the short charging time at higher speeds. Make sure that the ignition coil has a primary resistance of at least 1.0 Ohm (or more). We recommend using a 123 Red Coil.

- With 8 cylinder engines, we also recommend that you use a 'high performance' ignition coil in connection with the short charging time at the higher speeds. With an 8 cylinder it is important that the ignition coil has a primary resistance of at least 0.8 Ohm (or more). We recommend that you use a special ignition coil for the V8.

The manufacturer has pointed out to us that there are many complaints about fake "Lucas Sport" or "Lucas gold" ignition coils, so we do not recommend using them.