The ferret adapter is a great tool, as far as timing lights, they are not all the same. Most cars time at or near idle and it doesnt make a difference, but for our purposes, quality of timing lights makes a HUGE difference. MSD had a test comissioned a few years ago and found that most timing lights ( including most high dollar ones )began to fluctuate when approaching 2000 rpms ( which ironically is the point at which we need to set out timing at ) MSD wanted to test lights for REALLY high rpm timing for advance curve setting for race engines with their ignition systems and most all lights failed. THe only lights that consistantly passed accurately were the craftsman timing lights and the MSD lights ( ironically, made by Ferret, and obviously the ferret lights) ALL , and I do mean ALL others, failed with varrying levels, even the ones put out by snappy and mac.
I used to have a craftsman light and it was always spot on but it died a graceful death from serious old age and lots of use, right now I'm using a snappy light and it fluctuates a bit , but ive learned to read between the lines
Some of the cheaper digital ones will pretend to stabilize and give a steady line , but its only because their circuitry isnt capable of responding to the number of pulses going by at that speed and the circuitry is attempting to guess at where it is supposed to be, so while you may be seing a steady line, you really dont know if its reading high , low or somewhere in between.
