install help

[mpman]

05 suburban w/onstar, non bose putting in aftermarket HU, Amp, Speakers. Know I need interface for onstar & controls on steering wheel. When wiring amp to speakers, So chimes will still work.

1) wire back up to HU & splice into factory wire

2) is there another interface I need

3) run wires right to speakers

Also will tire pressure gauge & oil % still work

any help, thanks

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