Speaking of apps I have a new free audio tach app its icon shown - that is within 30rpm of a photocell or laser tach. Its neat to use in real time on the ground but more so in the air or on water. Has settings for 2 and 4 stroke engines mine is set to 50k rpm if I recall it goes higher.
Last edited by Pond Skipper; 04-03-2014 at 11:33 AM.