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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Not quite sure why you'd want to modify the reader. There's a boatload of WiFi ELM327 dongles for under $20 on Amazon. You can tap a 5V line to power the ESP32 in the vehicle for something permanent or use a power port for something portable. If you want to easy mode it, use something like the Elmduino library.
NOTE:
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Hence, a higher number means a more popular project.