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crankshaft
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There is also crankshaft https://github.com/opencardev/crankshaft but that's just android auto.
This is a newer arduino library for interacting with cheapo ELM327 based devices https://github.com/PowerBroker2/ELMduino. I chopped up one of my OBD2 elm devices that was having bluetooth probs and hooked it via serial to an old arduino uno I had laying about. I got his software_serial demo to work, shows live RPM data. The hardest part was finding the serial lines in the ELM unit. If you've got an arduino based device with bluetooth then it should be snap.