Ign Sense Hookup

i have a TK-780 installed in my truck, and its been tapped into the fuse box (by me) to a totally unused fuse that happens to switch with the ignition (labelled for P/W) and the radio switches on/off with the key. however even if i turn the radio off first, it turns itself on when i turn the key on again. if i was to wire up Ign Sense would the radio stay off if i turn it off before turning off the truck? also, how which pin would i need to wire to in the accessory plug on the radio?