I decided a 15 second delay was the simplest method. I’ve got my afr gauge in my ‘72 911, the car has no modern electronics besides the afr gauge. And with MfI, it sometimes takes a few tries before it’s up and running. 15 seconds means I reset the clock if I need to restart. So I’m not cycling the heater circuit in the O2 sensor nearly as much.
I used this one.
https://a.co/d/a7dAduB