Ignition Sensor on Clutch Pedal?

My '91 Chev 1500 has always gave me fits. The latest, I sometime have to push clutch in couple of times for igntition to catch. Is this switch hard to locate and replace? To be honest, I haven't even checked yet. Also, is there any chance there could be some other problem?

The sensor is right behind the clutch it is at the upper end of the clucth though. It is rectangular. It is easy to get 2 and it is easy to take off.