mr.FastInTheCorners

Hello,

I have an rx7 FC S4 NA (european/norwegian) 1986 and I'm very confused by the front switch/sensor on my transmission. The transmission has 3 sensors. If you look at the image below it has 2 sensors in the rear where the stern-port side switch is most likely the 5th/reverse sensor, whilst the stern-starboard is the neutral switch. But what is the front, bow-port side, sensor for?

Thank you so much for the help,
Eirik