Old Chevy Trucks

Hello,
I just got my hands on a factory instrument panel with the optional tach. how do I hook up the 3 wires coming from the tach? I know one of them is ground, but I also have a pink and a brown wire. Any thoughts?

What is a good muffler to put in my truck (305 Vortec V8) I don’t want one thats real loud and I’m not looking for top shelf stuff. Also is it worth the extra money to get dual exhaust?

Im also told the power disks and power steering components will also bolt on. Where can I get the correct info on this and what years work best?

have 2 remotes and tried the on off on off thing is there something else that needs to or can be done?

I want to tear out my bucket seats and center console and replace them with a 40/60 bench seat in my 93 C1500.