[lady-turbo-wrx]

Not sure what or why its happening,but im sure you lot will

Under normal driving my speedo works fine,no matter what speed im going,though i have a problem under quick acceleration,say going from 3rd-4th a bit sharpish,the speedo goes back to zero,but if i let my foot up a bit,or simply change up a gear,it goes back upto the speed im doing..
i have no hesitation or lack of beans,she runs (touch wood) like a dream..

Any idea's peeps????