Just to let you know I just did an upgrade from 4500s and had the exact same problem. Luckily, I found this thread, but could I suggest a few changes in the manual would really help?

- Appendix M - "Upgrading from internal AFS internal Engine monitor board to Dynon SV-EMS-220" is blank, should refer to Page 128, "converting from AFS-EM to SV-EMS-220"
- "Converting from AFS-EM to SV-EMS-220" on page 128, table could refer to the need to change pins 20 and 21 to 22 and 23 and make the changes in the calibration pages if you have capacitive probes.
- The comment here about the probes doing a self-test on startup was really helpful. Even though I have had them for 14 years I had forgotten.
- I had issues because the sensors I have are not the current ones. It would help if you referred to the need to check the sensors are all correct in the calibration pages.
- The Dynon manual for the EMS 220 shows the function and color code for each pin. It would be useful to have that in the AFS manual.

Cheers
Richard