I used this with my mychron 3, but it is compatible with 4 too. Sold the kart a few years ago and had this laying around as I switched to the yellow sensor/cable because that’s what mychron suggested to fix a bug as it wasn’t displaying proper data. I was assured it was the computer and not the sensor. I had it reprogrammed and shipped back with a new yellow cable just to be sure, I don’t remember re-testing the black sensor/cable.
As I don’t have a mychron to verify that this is working, I will take a return for full refund if shipped back within 1 week of receipt.
The sensor with the cable is $70.95 + shipping from Fastech.
My price, $45 including shipping within continental US.