Borrow a gps and drive at the different speed limits (using the gps speed) and write down what the datsun speedo is showing. Getting a different speedo drive to suit the wheels/tyres is whats needed. Using dots of 'white correction fluid' for 50,60,70,80,90,100,110 on the speedo glass is the ghetto way to fix it.

hi nugget182,check this website out www.bogaard.com.au.this company sells digital speedometer,all you do is simply plug it into the cigarette lighter.
thanks

Ok cool thanks so much dude your always a great help , and yea I think its 30 at 100 , and I think Its showing me faster then what I am going if that makes sense , does it matter about the wheels not being stock either ? Or will your way work with them aswell as the hear box

What percentage is it out? 30km @ 100 kph? (30% error) or 30km @ 50 kph (60% error) ?

Next, is it 30% slow or 30% fast?

Then, find out which gear is in the gearbox. If it is the standard 17-tooth gear, add or subtract the percentage. 17+30%=21 tooth or 17-30%=12 tooth. Buy the right gear from Nissan. They come in 16,17,18 or 19 tooth versions. Anything else can use a ratio converter box from a speedometer shop or racing shop. See http://datsun1200.com/modules/mediawi ... =Speedometer#Drive_Ratios

Hey dudes just wondering , I've got a 5 speed 1200 Ute 78 model , so gearbox and wheels / tyres aren't stock either , I'm in Australia with klms and was just seeing how I would get my Speedo accurate , like how wouod I go about doing that , I think its out by about 20-30ks , cheers