...............................................I've found the pulse adaptor does not work very well past 1500rpm, and even.... you need to take into consideration the load on your pump when you check the timing, it's impossible to do at neutral, you have to drive the car at various rpm and load....................................
Finally used my pulse adapter on my engine today. And yes I can confirm that the $50 TinyTach clamp works fine with the Snap-On box, so if you have a Snap-On box and don't want to pay them $300 for a new clamp the TinyTach one is great! I found that the clamp did not work reliably at all near the pump, but works great when attached to the #1 line near the injector.I actually dropped my timing back from 1.40 to 1.30 today as the clatter was overwhelming. I think my great big .275 injectors have the same effect as advancing the timing a bit since the actual injection duration is probably extremely short versus stock nozzles - the entire injection event likely only takes a fraction of the time of stock .183 or whatever nozzles. With my timing at 1.30 I read 8º advanced, so it was probably pretty darn close to 12º when I had it set to 1.40 initially.