After installing my new head unit, my blinker, tail lights, and dash lights no longer work. i have uninstalled and reinstalled several times

 

There's a couple different circuit drawings, depending on the car.
4-cyl or V-6?
Automatic-off headlights? (I think that's a feature on EX cars?)
Canada cars are different from USA, and they have differences depending on daytime running lights.

Exactly what kind of 98 Accord are we talking about?

With a quick look, I don't see the stereo head-unit participating in the lights, but the multiplexer unit does. What all was done to install the head unit? Does it have some connections to other circuits that aren't the same as the factory unit? (Or did you literally get another factory head unit?)