Body Type SD
THE CAR IS IN DRIVE ,DOESN'T RUN ROUGH, TRANSMISSION SHIFTS FINE.THERE IS A WINDING NOISE AROUND THE DASH CLUSTER IF YOU GET BLOW 20Mph you dont hear it ,above that you do. Highway speed at 60mph the tach reads 3800 rpm.
Do you have paddle shifters, sport mode, or other controls that let you manually control what gear the automatic transmission is in?
For example, the 2013 Optima SX should have paddle shifters so you can adjust what gear the transmission is in.
Once you engage the manual shift mode, you will notice that the dashboard displays a number for what gear the transmission is in. Normally, it just shows "D" for drive. But in manual mode, it would say "3" or whatever gear.
No CEL? Maybe I'm on the wrong track. Are you saying that the engine/trans is fine, but just the tach is reading high? If so, just out of curiosity, have you changed the plugs lately? At times plugs will cause a problem with the tach, but most also causes a cel come on.