Thanks, Charlie - I think I'll try the high current driver that puts the ignition module on the MS2 board - no sense in redundancy of an ignition component or looking for other trouble.

The MS2 manual does suggest that the VB921 driver circuit is probably the best solution for most optical distributors..... it was the word "most" that I didn't trust. <img src="/forums/images/graemlins/wink.gif" alt="" />

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum