Got a complete 5 speed N4 gearbox from a 2003 1.8 VVTi - located in lochgelly 2 miles from Driftland. Did 91k, no issues with box. You can come get it for £30. might have the sensor you need. Pics in the ebay advert below. Mazda MX5 MX-5 Mk2 Mk2.5 1.8 1800cc 2003 5 FIVE manual speed N4 Gearbox | eBay