Summary: also located with the rotor tachometer N1 is a separate tachometer The gas producer turbine has no mechanical connection to the power turbine hence the separate tachometer See figures instrument and turbine engine 1 and turbine engine 2 There are some very critical areas when flying turbine helicopters and most important are the Torque and TOT It is very easy to
Image Dimensions: 1284 x 891
Image originally found here.