tach output appears to not function

Question

I have a 2018 Wrangler JK, everything appears to be functioning correctly with the exception of the tach output. Am using the evo with the advanced keys push to start system. I was not able to locate a setting in the flash updater for turning the tach output on or off.

Answer 1

There is no tach option on or off.

 

If you meter the tach output wire on the evo when starting the vehicle what does it do?