After going through various gear displays in different cars we were tired of them failing (segments burned, blinking, wrong gear, etc...) so we have developed our own 7 segment display with a self-programable code which saves the values of the sensor for each gear. This means it can be used with any gearbox that has a gear sensor. Additionally we have spend some time analyzing various methods of filtering the signal to get better results and avoid typical blinking of the segments or wrong gears.
If anyone could be interested send me a pm.