How do i put a new deck in my 89 sho

[llamaking122]

also when u take out the stock head unit there is a plug hiidden on the left of the inside all of the speakers are double wired so this is the easiest way to do it

 

[Devin]

If you don't use the non-amped wiring attached to the side if the HU bay, and your HU is not smart enough to use the factory amps in line, your HU will amp the amp's input and you can get really crappy side effects. My stereo sounds MUCH better after I put my Pioneer on the non-amped cabling.