HI there fd owners
 

I have a problem with my fd. When I start and warmup my fd rx7 it idles fine but then once it warm up my speedo reads 10mph when the car is on neutral. What can be the problem. A faulty speedometer:scratch:

Might be a faulty speedometer sensor or the speedometer itself. The FD Electric Troubleshooting manual may help you with identifying which component is not working properly for your scenario.