my speedo has always been a bit intermittent, but now its duff. it will work occasionally if ive been stationary up to about 20mph, then it just drops off. then i get hicas warning and no powered steering. now ive read the articles about dry joint and all the rest but if i pull it all apart what exactly am i looking for with a "dry" joint? and do i just remelt it and add some more solder? i also read jeffs thread on the speed sensor popping out its cartridge, and causing the issue. but how do i check the actual functionality of the speed sensor?

A dry joint or track will look dull, may even have hairline cracks in the solder or at the point of a component. You are looking at the R10 resistor area, which is where the signal is converted. Re flow with fresh solder any or all tracks which dont look healthy, a magnifying glass is handy as sometimes not as obvious by eye.

right ive pulled the dash cluster out this morning and removed the speedo, had a good look over the solder joints in the light and they look pretty good, thinking back before i changed my speedo from the 300kph one i had the same issue its just got worse. anyways, i also looked at the speed sensor its all intact and not hanging out. the only thing i can think the problem is now is that the speed converter is junk. its spliced into the harness with bullet crimps. il be trying it out today to see what happens but yeah need to sort it really.

I've got the same problem, no speedo and power steering going on and off. I've got another speed sensor to be fitted but looks like a big job to do it. Let us know if you fix it.

You didnt mention you had a speedo convertor lol, usual culprit to take out the equation if all is not well.

If it is the converter try changing the 12 volt wire that powers it to a different one. That solved the problem for me and only takes a few minutes to try.

I didnt fit it so ive no idea how the things wired, theres 4 cabl es s going into it.

In the faq section.

Any chance of a link mate zcrolling through on the phone is a pita.

http://www.300zx.co.uk/forums/showthread.php?117157-speedo-delimiter-box-wiring