yeh-- ZDZ/ Evolution (some models) /3W/MVVS/ ROTO and I think- the newer Falkons used by BME may (?) include this feature -
It is rapidly becoming a std --I can't imagine that DA has not already looked hard at this - they have a ZDZ80 and a 3W 80 for lookeesee- - everyone in the business looks at others stuff - unless they are just plain clueless--.
Everyone still has their own ideas as to how to do it --
so far - the setups go like this :
3W - mount an onboard 3W tach display -also a LED flashes on full voltage power up
Falkon -read at the switch -SOME models
Roto/Evolution (some models)- LED flashes on full voltage power up - read LED with optical tach as desired plus read saved max rpm at LED
ZDZ- plug ZDZ tach into ignition switch - read direct in rpm or as a bar graph- read saved max rpm
It would be nice to have a standard for all of this but still too early - everyone is not in the game and each want to feature (sell) their own idea.
Way back when-- American cars had different shift arrangements on automatics - PNDLR and PRNDL- after some problems - one pattern was agreed upon . a standard tach readout ignition is also likely to evolve --