looking at a u.s car wiring diagram, i can't see an rpm input from any trans, auto or manual. rpm comes from the speed sensor from the flywheel, then td/rpm output goes to the mas relay. i would guess the manual flywheel MIGHT be at fault. the sensor reads the ring gear teeth. maybe the wrong rpm mas relay? seen it with earlier fuel pump relays. 4 cyl relays don't play well with 6 or 8 cyl motors. good luck, chuck.