Black top CAS has a clear signal to the ECU compared to the green top, you can use either one. When setting up the 1g CAS to DSM link you'll want to make sure the CAS is at 5 degree BTDC. I believe you'll be able to change the base timing after initial setup.
If you go with a 1g black top CAS you'll just need to purchase a wiring harness/or rewire the harness to invert the the CAS for the ECU, its much easier to buy the cable because it'll be plug and play.If you have DSM link you'll be able to convert the signal using link, CAS harness adapters...
I had the same issue with mine, ended up being the switch. I would try checking your local junk yard for a switch to swap out, good luck and hope this helps.
I believe they are vehicle specific but I'm sure you can get them off any DSM laying around the junk yard.Also don't forget to check some Hyundai vehicles, some of them might sure the same connector.