well did a bit of research....

1200 gear into rx7 gearbox is a no go... different size and the gear must enter the box on oppisite sides as the gear splines are opposite...

found out that there are no interchangable speedo drives for an rx7 so i have to go with the ratio box to correct my speedo..

found a place that'll do it for $120...

so ill see how i go with that....

thanks boof and mik for your help so far..

let you's no how it goes..

speedo from the rx7 wouldnt work accurately... cos the ute has a 4.1 diff ratio in it...

would be like putting 4.11's in the standard rx7... would throw the speedo right out

in my old mini they recalibrated it on the actual speedo guage not the gearbox end... there is just a plastic worm drive on the back of the speedo, if you could workout the gearing on that and modify it you could make it more accurate. Why did nt you just use the sppedo guage from the rx7 as well, must have been better looking than the 1200 one. Would have solved all your problems... maybe just a trip to the wreckers.

was just thinking that since the standard 1200 speedo cable matched up to the rx7 gearbox... perhaps a speedo gear from a 1200 may fit into the mazda gearbox?

the gearbox ratio's and wheels sizes may make the speedo read innacurately.. but having the standard 1200 gear should make the speedo a lot more accurate since its for the standard 4.1 diff... and the mazda gear is to suit a 3.7 or thereabouts diff...

only problem is ive sold my old running gear...


so if anyone has a standard 1200 ute speedo gear (must be from 4.1 diff ute) im willing to pick it up or pay postage plus whatever u want for it...

worth a shot i reckon...might not make it 100% acurate but within 5% id be happy.... thoughts??

is there any other factory 4.1 diff cars with the same speedo cable setup??

sounds like a scam to me... $220??

its a cable that is driven by a gear... its not rocket science

surely changing the number of teeth as required on the gear will adjust the speedo reading to within the tolerances??

im gonna look more into it on monday

thanks for making the enquiry for me... i may end up going down that path but not just yet... will see what i can discover...

this is all using existing speedo, gearbox, etc. What the guy told me is they put a 'box' at the gearbox connection of the speedo cable, the cable now goes into this 'box', inside the box is 4(i think??) smaller or bigger gears to accurately adjust the speedo cable rotational speed to get the speedo in the dash reading right.
hope that makes sense oh yeah they do take the car for a drive first to assess how far out the speedo is - faster or slower.

i have also seen a ute rigged up with a push bike/bicycle speedo - magnet glued to the inside of the rim, pick up attatched to the strut, wire run up into the cabin and little digital read out bluetac'd to the dash
by all claims it worked pretty accurate and the good quality ones will read up to 200kmh and are backlit

Boofhead- Is that an electronic speedo of some sort that they are using, or just an adjustment of the stocker?

This is something that really bugs me. Bike speedos are cheap as and can be adjusted for different wheel sizes really easily. Why the hell can't you get an eletronic car speedo that can be adjusted for whatever final drive and wheel combo you are using????? All you need is a balanced collar with a magnet to bolt around your driveshaft and a pickup for the signal.... not rocket science to put together!!

I have asked a few people over here and they dont reckon this product exists. Internet searching came up with a few home made versions, but that was it.

There would have to be a market for it.

spoke to the place today - $220 drive away and you'll have a speedo thats spot on to suit your gearbox/diff/tyre combination. Takes around 2-3hrs 1st time, and if you ever change your gearbox/diff/tyre combination again, it's easy, cheap and quick to adjust your speedo to suit the new stuff.
the place is :
Howard Instruments unit 1/125 Melbourne Rd, Nth Geelong
ph : 52 787 822

cheers adrian... your a champion!

hey ange, if you have no luck that way, there's a place in geelong that does them. if i think of it tomorrow and i'm near by i'll see what they do and how much $$$ for you.