@ spectra
You can ur self check the accuracy.
its there in the pic:)
i mean my analogue rpm meter was at 2006(approx)
and the digital one from the OBD II port was giving me 2012 (transient)
since the data acquired is from the car itself and using the same sensors
so no need to worry about accuracy sir (H).
@Got the adapter from Amazon .com for $99.
it plugs into OBD II port underneath the steering