On the Mk1 2gr 6 speed i made my own digital gear display, but it used far too many microswitches on the gearstick and didn't have the ability to display 6th or Neutral properly, so this time around i wanted to go one better.
This is probably more easily achieveable with clever electronics based on RPM and Tach inputs, but i'm not clued up on microprocessors etc, so i have put a few hours into a switch and relay circuit that i think works, this time only using 4 switches instead of 6, but it does use 5 relays.
The gear indicator unit i am using is a seven segment display but already prewired so that each wire grounds the segments needed to make a digit, so no need to use a 4 bit binary system (although that too may be possible with clever use of switches/relays)
I think i've come up with a circuit that will ground each wire it needs to independantly of the others, and also displays neutral when none of the others are selected..... it has melted my brain but i am asking some of the more cleverererer electrical types among you to prove/disprove the logic of this circuit... ie, does it work. Some of the polarities on the relays might be wrong but ignore that for now, if you study the diagram you will see what i am trying to achieve.
Also i welcome any comments to simplify the circuit using less relays or switches.
This unit is going to be mounted in the centre of the Evora cluster in the unused automatic gear display area.