How do i display the legend of multiple lines in a figure?

I am having an issue with displaying legend entries for multiple lines in a figure. I followed an example on here overlapping axes and modifying tick marks. However, the example never displayed a legend. Currently Matlab displays a figure such as below, I need to link the correct line to the corresponding label. Any help is appreciated, thank you. If possible I would also like to know how to move axes out a bit from the plot horizontally. Code for figure is below image:

 display('Plotting');
x = 3300:3800;

y1 = RPM; y2 = VS; y3 = PT; y4 = FDT; y5 = TCT; y6 = RPS; y7 = Energy;

figure;

ax1 = gca; get(ax1,'Position') set(ax1,'Xcolor','k','YColor','r','YLim',[0,2000],'YTick',[0:200:2000]); line(t(x),y1(x),'Color','r','Marker','.','Parent',ax1)

ax2 = axes('Position',get(ax1,'Position'),'XAxisLocation','bottom',... 'YAxisLocation','right','Color','none','XColor','b','YColor','b',... 'YLim',[-32.5,-25],'YTick',[-32.5:2.5:-25],'XTick',[],'XTickLabel',[]); line(t(x),y4(x),'Color','b','Marker','none','Parent',ax2)

ax3 = axes('Position',get(ax1,'Position'),'XAxisLocation','bottom',... 'YAxisLocation','right','Color','none','XColor','b','YColor','b',... 'YLim',[-32.5,-25],'YTick',[-32.5:2.5:-25],'XTick',[],'XTickLabel',[]); line(t(x),y5(x),'Color','b','Linestyle','--','Marker','none','Parent',ax3)

ax4 = axes('Position',get(ax1,'Position'),'XAxisLocation','bottom',... 'YAxisLocation','right','Color','none','XColor','b','YColor','c',... 'YLim',[0,280],'YTick',[40:20:140],'XTick',[],'XTickLabel',[]); line(t(x),y6(x),'Color','c','Marker','none','Parent',ax4)

ax5 = axes('Position',get(ax1,'Position'),'XAxisLocation','bottom',... 'YAxisLocation','right','Color','none','XColor','b','YColor','m',... 'YLim',[0,280],'YTick',[40:20:140],'XTick',[],'XTickLabel',[]); line(t(x),y2(x),'Color','m','Marker','none','Parent',ax5)

ax6 = axes('Position',get(ax1,'Position'),'XAxisLocation','bottom',... 'YAxisLocation','right','Color','none','XColor','b','YColor','m',... 'YLim',[0,280],'YTick',[40:20:140],'XTick',[],'XTickLabel',[]); line(t(x),y7(x),'Color','g','Marker','none','Parent',ax5)

ax7 = axes('Position',get(ax1,'Position'),'XAxisLocation','bottom',... 'YAxisLocation','right','Color','none','XColor','b','YColor','m',... 'YLim',[0,280],'YTick',[40:20:140],'XTick',[],'XTickLabel',[]); line(t(x),y3(x),'Color','k','Marker','none','Parent',ax5)

legend([ax2;ax3;ax4;ax5;ax6;ax7])