I added a few MOVs along with some resistors, similar to all the other meters I have looked at the hold up. I hadn't thought about the fuse when I made the video and talked about cutting the trace and moving it. This meter detects a blown or missing fuse with this circuit. So I left it.
Using a spare plug, then wrapped the inductive pickup's cable around the wire and ran it like this for about 15 minutes without a reset and the RPM is stable (as long as the RPM is high enough to disable the multi-spark). The OEM inductive pickup that was left out of the box when I received it, may not do as well as this Fluke clamp.
I've been asking Brymen about their 319s. They have confirmed that while they support both 2 and 4 stroke engines but they only support 2-stroke wasted spark, not 4 like I run. So this will cut the RPM by half. This meter is also a little more generic with a mV and uA range. The bar graph updates 40 times/sec rather than at the normal display rate like the All-Sun. It also has both a + and - trigger rather than just +. Sadly, it does not appear to be TRMS.
They watched the video where I had the two Brymen's on the ignition jig and Dave's went through the reset. It may be interesting to see how the BM319s would handle this. The 319s is also marked for CAT III 600V. None of this CAT II stuff. So if I run one, I will transient test it as well (after I run all the other tests).
If the 121GW is released with an open source, maybe we can role an automotive version of that meter.