Reddit reviews MakerFocus 2pcs I2C OLED Display Module 0.91 Inch I2C SSD1306 OLED Display Module Blue I2C OLED Screen Driver DC 3.3V~5V for Arduino
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★ ★ Product Manual: https://drive.google.com/open?id=14A_luFwqvZaKu-PKTfJdWmUZ4T4Wk65XOLED display, no need backlight, self-illumination, Display Color: Blue. Plz note: These I2C OLED Display Module comes without pin headers.The display performance is better than the traditional LCD display, also lower consumption; IIC (I2C communications) simplifies connections.Use with Arduino, ESP8266, ESP32, STM32, etc; 3.35v Power; Operating temperature:-40 - 85 ℃; Resolution: 128 x 32.We a Strong After-sales Service Team: As long as you have any questions about the product, we will resolve your issue immediately if received your email, your satisfactory purchase experience is our greatest hope! How to email us? Plz click “MakerFocus” and click “Ask a question” to email us! Looking forward to your consultation!
I used the OLED screen from amazon - Link to Product
But a lcd monitor should be even easier to hookup imo. You can same-day ship things from Amazon depending on where you live.
Can you upload a picture of your wiring? I'll take a look
https://www.amazon.com/gp/product/B0761LV1SD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
You can find them other places a little cheaper, but delivery is usually drop shipped from China so it takes longer.
Why just not go for OLED displays ?
You're asking a lot here. If it was simply Bluetooth/Aux, I'd suggest that you gut the head unit, stuff one of these in there, and solder leads from the forward/back/play/pause switches on the amplifier to the 1 2 3 4 5 presets on the head unit.
You could try running the speaker outputs from the amp board, through the volume pot of the head-unit faceplate and then from there to the separate amplifier, which should give you analog audio control from the original volume knob. Presumably the external amplifier would have connectors for a sub.
This would give you Aux-in and BT sources, volume control, and control of your BT source from the faceplate, but not AM/FM radio or an EQ. There are third-party DSPs that you can use to tweak the audio, which I can't tell you much about because I'm not a car audio guy.
My inclination is to tell you to lower your expectations and just design it around BT and Aux, but that's not what DIYers want to hear. You might be able to incorporate all of this stuff by learning all about Arduino, and linking together a bunch of modules, and writing your own software. If you did that you could even fit a new OLED display into the faceplate and program yourself a totally custom readout! None of this hardware is expensive-- most Arduino modules are available shipped from China for a few dollars apiece, but you're going to have to learn a LOT if you're not already familiar with programming and basic electronic principles.
Good luck!