A nice pricepoint might be tough. Anything much above $50 and the SGII starts to make more sense.
- RS232 Freeduino ~$15
- 16 x 2 LCD ~$10
- ELM 323 ~$15
- Assorted Parts ~$3
- OBD-II plug ~$7 (5 minimum)
Junkyard, maybe? It
does drop down to $3 after the first 200...
If it's possible, I say drop the ELM. The ELM327 will help with the "one size fits all" aspect as it does every interface...but $30...eek.
- LostCause