my speedo has stopped working on my UK TT. it is not the speed sensor it is deffinetly the speedo. I have tried resoldering the entire back of the speedo incase of dry joints but still nothing.

Buying a new UK speedo seems expensive and hard to come by so i am thinking of getting a jap speedo from ebay and stick a convertor on it and use my uk dial face so it still shows mph.

however it seems the convertors on ebay plug onto the ECU so would plugging in a jap speedo onto a UK car & ECU show speed in mph or kmh?

Get in touch with South West Z they had a set of UK clocks for sale - £120 delivered I think....

http://www.300zx.co.uk/forums/showthread.php?t=87280 provisionally sold now but give them a call anyway. If not available from there then try AndyZ from supercar parts in the traders section - he should be able to sort you out. Avoid speed converters, they screw up the signal to the PAS, ECU and autobox (if it has one)....

yeah i have heard that before about speed convertors. What i am thinking though is, if my UK ECU is outputing the speed in mph, if i connect a jap clock will it show the speed correctly in mph if i stick the UK dial face on it? or is there another conversion / calibration that takes place in the clock circuit board that will manipulate the speed output show???

Nope - the speed sensor goes to the clocks, THEN onto the various ECUs/control units so the converter screws the signals for everything... Another thing is that when you remove the needle it usually knackers the speedo if you're not VERY carefull....

You could always use a jap spec speedo and just replace 1 resistor in the speedo pcb, as per these links

 

http://www.300zx.co.uk/forums/showthread.php?t=35682

http://www.300zx.co.uk/forums/showthread.php?t=36601