No signal limiter necessary. Just get the proper wiring harness and it'll use the preamps of your existing head unit. Make sure you have 4v or above preamps or the quality will suffer. Wiring was simple, steering wheel controls were more of a pain, but still not anywhere near as hard as some of the newer cars.
https://www.amazon.com/Metra-70-7553...%2C111&sr=8-10