Finally got the little (3 pages) written up on how I was able to get this running on a Raspberry Pi 4B w/ 8 GIG of ram. The OP25 portion pretty much stayed the same as a regular linux install. It is more on getting the USB RTL stick to work properly (page 1). Thank you to everyone who has helped me on here to get this working, so I have attached a pdf of the instructions I used to get this all installed on the Pi.
Now I am off to finally try to make an old unit new again.
My whole intentions on getting it running on the Pi was so I can gut out and old non-working (powers up somewhat but is non functional otherwise) Electra Bearcat III 8 channel crystal scanner and putting the RasPi in the chassis along with a 2.5 watt mini amplifier for the audio. I will be using the led's in the scanner as well off the GPIO pins on the Pi to act like what the scanner used to do. I just need to figure out how to make the python program pause on an led when there is audio out. I will probably start a new thread somewhere in here, not sure if it will be in the SDR forum or over in the Uniden Tavern.... I really don't know where it would fit actually...lol....
Anyways, I will be documenting on here as I go building this as it is basically for nostalga purposes and for the fun of it. If it wasn't for OP25, I probably wouldn't of messed with trying this but I used the boatbod version years ago and after getting that running once on a Pi 3+b, it is when I came up with the idea of resurecting the old scanner. Some parts for the build have been ordered so it won't be long before I can try to get things situated, programmed and tested before really tearing into the old scanner to install things.
Edit: Forgot to mention, if anyone is good in Python & Raspberry Pi's, please send me a PM as I am trying to figure out the pause on the led's without much luck looking online. Thanks