1969_Mach1 333 Report post Posted October 10, 2015 I am in need of a new timing light and have recently noticed some say compatible with MSD and some don't. Then I noticed MSD mentions that their CD ignitions with cause interference with some digital timing lights resulting in erratic timing flashes and tach readings. My last digital timing light was a Ferret rebranded as Cornwell, it finally quit working after over 15 years but it had that eratic flash issue with my Mach 1 and MSD ignition. I am thinking of going back to a timing light with just a dial on it for the advance. My question is are any members here using a digital timing light with an MSD ignition? If so, what brand is it? Thanks, Mike Quote Share this post Link to post Share on other sites
sportsroof69 13 Report post Posted October 11, 2015 People say you're not supposed to, but I use a Craftsman with the dial, and it always works fine for me. Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted October 11, 2015 So far I'm still thinking of going with a dial advance type. There have been some fairly priced used Snap On dial advanced timing lights on EBay. I know those were rock solid from when I worked as a Mechanic. Why are dial advance type timing lights not supposed to be used? I have noticed the two timing lights that MSD offers have no dial advance and are not digital. Quote Share this post Link to post Share on other sites
TheRktmn 15 Report post Posted October 11, 2015 I have an old RAC 'on the plug' type and a newer (10 years) Craftsman inductive with timing knob. Both work fine with my MSD5 and 6AL. Quote Share this post Link to post Share on other sites
larryc94 38 Report post Posted October 11, 2015 Snap-on dial don't work (about 3* retarded) compared to a fixed Snap-on. It's not a question of them working, I think most will flash but not accurate Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted October 11, 2015 Thanks for the input larryc94. I'll stay away from a used Snap On Dial advance timing light. Inaccurate flash kind of fits the description of what I read on MSD's site. Quote Share this post Link to post Share on other sites
fordguy69 24 Report post Posted October 12, 2015 I've got two older Craftsmen, one with dial and one without. Both work fine with MSD boxes. Quote Share this post Link to post Share on other sites