A method of reservoir management linking. Instead of using prior art triangle waves, a ramp signal having a first state of about 90% or greater is used and a second state for the remainder of the cycle. The magnetic field may be time varying or time invariant. A light transmissive light guide is associated with the LED units and has a plurality of input widows. A unitary power supply may be provided for both boards through a fixed connector. The time lapse image is generated using the first image and the second image on which the positional correction has been performed.