Bert, the extender works perfectly. If you can please provide the link to where you read that there is an issue using that method, I would like to read it. I've used that extender method, starting with my 1st COPs installations of Rasant systems, as well as motec, M'squirt etc. basically all of the COPs systems i've worked on.
Note: some timing lights will pick up logic level signals, which is what the MS3X and other systems use to trigger the coil ignitors, others do not and require the extender..
regards,
al
Remember, your crank trigger system just requires for you to check initial timing to ensure sync and that the M'squirt initial timing setting matches the actual timing, as verified by your timing light. I set the ignition advance to "fixed" timing at 0 degrees and verify with my timing light. The tooth #1 angle is used to dial in the timing. I.E. to set the timing at TDC. Once that is verified, you change the timing back to "Use Table" and then the timing chart controls the timing/advance......and, you can use your timing light to double check that the timing is following the chart and advancing per the chart.
You have your engine running....so this part of the process must be well underway.