I have tried the search function but cant find what im looking for. Being completely new to nissan 300zx I have no idea what im doing but I just brought my jap import car and it had a KBTV speedo converter/ delimiter with mph dials everything is working fine bar the speedo, it work's but seams to be just over double what im actually doing the needle hasn't been played with the previous owner just said it has stopped reading mph and has gone back to kph. I've tried to email kbtv for some help but they just said I make no sense and that if it was the converter/ chip then neither the speedo or rev gage would be working. Could anyone help me or point me in the right direction? I would be very great full!

There are a few speedo convertors around which do not work or are badly made, to make sure it is wired correctly check out the tech faq section for the diagram http://www.300zx.co.uk/forums/showthread.php?117157-speedo-delimiter-box-wiring

 

If the wiring is fine, get hold of another convertor or go for the UK clocks, they will read in MPH and raise the limit and do not require a convertor.