head unit

hello im back again how do i wire up a head unit got it in the van allready know that i need a adapater for the ariel . how do i get it wired in or is there a wiring diagram anywhere
thanks simon

 

ok thats cool but what wires am i lookin for under the dash

 

there are none

Pick up a perm live from the back of fuse 7 to yellow on the head unit
And ground of the headunit to the body or the brown on the back of the dash
To have it switch off with the ignition the red from the head unit needs to go onto fuse 12 or join to the yellow if you want it to run without the key