Hi everyone, with the car running and driving much better now, my focus has turned to the electrical problems, starting with the tachometer. My SD has an 81-84 engine swapped into an 85 chassis. As far as I'm aware these use different pickups for the tachometer signal (on the crank pulley for 81-84 and on the bellhousing for 85). The tachometer amplifier/diagnostic port is still present. Has anyone been able to adapt the earlier tachometer to work on an 85 car? I assume some signal processing would have to be done as there's only one reluctor pin on the crank vs many teeth on the flywheel.