Garmin 720/740 used to display RPM

[BRBSTA]

Has anybody investigated using a Garmin 720 to display RPM for a cummins 8.3L 6CTA 2001 vintage I am looking for a accurate digital tach and would not mind having a back up Chart/GPS

Is there anyway to get a MNEA tach signal from these moters


Thanks BRBSTA :smt100:smt100:smt100

 

[BRBSTA]

ttt