Various; some better than others. Many sold in the UK may in fact be illegal; poorly lit, or (here's a new one to me) no kph ticks marked (and they must be illuminated). According to one MOT examiner here in N. Ireland, the speedo faces require illuminated mph as the major scale, and illuminated kph as the minor scale.

This is where I was quick off the mark with the Canadian car in Saggart; 220 kph speedo (I guess I could have changed the face on this to 140 mph version) and metric oil gauge, which I swapped with someone for a US speedo and oil gauge. The whole instrument panel was a bargain IR£30 (about £26). I have some spare gauges going cheap for anyone (£15 the lot plus post; fuel gauge, rev counter, metric oil pressure gauge ("real") and temperature gauge, all work fine. Plus I'll throw in the backing panel and circuit board from a 91-92 Canadian Miata; doesn't work properly in the Roadster as the brake light stays on (there are some extra resistors soldered in). 5Speed were advertising coloured gauge faces for MX5's and Roadsters, so presumably 2 different versions.

There was also a gearing system at one time (advertised by jcars.com, who have since disappeared) to convert a 180 kph speedo to 180 mph for £100 which is kind of pricey for something doesn't look right. Mazdaparts in the US were doing Miata clock sets (won't split) for $125 plus post. Is this for the NCT? (1/00)

All the speedo conversions I have seen for Roadsters show the top speed at 140 MPH.

?????? All the ones I've seen go to 110 or 120. Mine is marked to 120 (at about the half past five position) AFAIK, it's pretty accurate. The speedo has an internal stop at about 116mph, so it never reads more than that. Need calcs from the rev counter from there on. ;-) BTW - got my dial face conversion from Demon Tweeks - there are plenty of others about. (1/00)

Well spotted, I didn't notice that until I had bought a set of white dials, not only for the look but also to change from MPH to KPH.

The dials are straight replacements with no gearing change. So at low speeds (30) their reading is just about spot on. However the faster you go, the wider the margin for accuracy. By 80 your the speedo would be reading 100/105 MPH.

The only compensation is that if you run to the speed limit you will in fact be going slower rather than faster & not be caught by speed cameras :o)

I will be having a rolling road test just to check the top end difference in an attempt to see how much difference there is. (1/00)

Speedos and speed restrictors for Roadsters; There are 5 combinations of Mk1 Speedo heads out there;

1. UK - mph and 140 mph max
2. US = as UK but 'USE UNLEADED FUEL ONLY' at the bottom
3. Euro = as UK but kmph as main numbers
4. Japan/Eunos original (illegal in UK) = 180 kph max (to go with the 112mph speed limiter fitted)
5. Japan/Eunos fitted with printed face - this still is 180 kph but now has 100 mph as the maximum number in large writing.

They all have the same gearing/ratios but the maximum is higher on non Roadster speedos - 110 is at 4 O'clock on a Roadster but 2 O'clock on a Euro car .. hence Euro car speedo can read 140mph.

You can get a little in line gearbox to change to km to miles. so trip meter works and you add stickers to the face to change it to miles.. if you just go for replacement dial face on an Eunos Speedo the trip/odometer will still record in kms..

So then you come to aftermarket dials - these are all for the UK/US 140 mph style speedo head - you could get custom ones but.... if you want to know how much faster than 110 mph you are going you need a UK/US speedo;
1. UK scrapyard but be quick as they are the first thing to go..
2. US scrapyard - I got my first pair from Mazmart at about 80-100ea GBP
3. Mazda UK = 320 GBP if they would sell it to you!

Also if you have an Eunos. do you know it is speed limited to 112mph - this is easy on the 1.6 (remove a wire from the speedo), on the 1.8 this option is not so easy as the ECU uses the speedo cruise control output to control the speed and also control the engine (maybe... unknown what removing the speed sensing wire from speedo does)

According to the MOT hotline (0891-615977) your car IS illegal with a Kph only speedo For those that are interested and need to convince their dealer that the car should have miles and kilometres, the UK regulation is:- The Road Vehicles ( Construction and Use ) Regulations 1986 - Regulation 35 The European Community directive is 75/443/EEC . You can speak to the Vehicle Inspectorate direct on 01792 458888. (1/00)

My speedo reads in mph, but the odometer and trip meter are still both in kilometers. This is different to the Skyline I imported where the conversion process took care of these - both then read in miles.

As far as I recall, there's either some electronic setting that does it, or a miniature 1.6x:1 gearbox that fits onto some speedo drive cable or other. Can either be done to the Eunos?

Is it feasible to also alter the odometer reading (e.g. so that 80,000km becomes 50,000m)? What's been done to other Eunoses? (4/00)

Most have had a replacement speedo face that reads 0-110 or 0-120 mph, and kept the kms odometer reading. Some of these may be illegal (according to an MOT inspector) if they do not show mph _and_ kph (as minor scale) illuminated at night. I was picked up for this at my last MOT (didn't fail, but the tester thought it was iffy, and the testers here have no profit motive like in GB).

There was a company (www.jcars.com) which advertised a speedo recalibration service; recalibrate the speedo in mph (so it reads 0-180 mph), and the odometer reads off in miles. Apparently involved a box of tricks on the speedo cable. However, it appears that their website is now dead.

Mazda UK sell mph speedos for 200, and are now levying an outrageous 200 exchange fee upon receipt of a "broken mph speedo". I fitted a US speedo; the odometer reading is about 5000 miles more than my actual, close enough that I'm not bothering to reset the clock (looks easy enough btw, but I reckon I've got an honest face when/if I come to sell).

Mazmart (www.mazmart.com) will sell you an entire used Miata instrument binnacle for $125 plus post; bonus is you get to change the oil pressure gauge to PSI. The only difference in speedos is that US ones are marked "unleaded only". The speedo is a straight swap for the kph one, nothing else required. (4/00)

Thanks, that link looks useful. I've also been offered a US Miata speedo so there's plenty to follow up. (I have to say that folk on this list are an awful lot more helpful/responsive than the GTR list!), I'd also want the odo reset to the miles equivalent of my current kilometre reading (c56000km).

Anyone know roughly how much it'd cost to get this done and replacement instruments fitted by an independent? I want the changeover paperworked to avoid accusations of clocking when I sell it on. (4/00)

I've had my Eunos for 18 months now and loved every minute of it. When I bought the car it was still reading km/h and the garage promised to change this to mph before I picked it up. When I went to pick it up the work hadn't been done, I was too excited to wait another week (dial face had to ordered) so I agreed to bring the car back at a later date. The garage is over 70 miles away so it took a couple of months to arrange an appropriate date. The garage carried out the work, and everything seemed fine but on the way home I found the speedo was reading about 15 mph under and the oil pressure gauge was reading 6 all the time (settling at 1 when the engine was off). To cut a long story short 4 visits to the garage and 12 months later the speedo is still 15 mph under and the oil pressure is the same.

The garage tell me the speedo head unit has blown and they don't know if it can take an MX-5 unit. Can anyone tell me if it can or does it need to be a Jap one ? (1/01)

A UK unit will fit, but you'll find it very hard to find one, and it'll be expensive. Isn't it just a case of the needle having been pushed on in the wrong place?. And the oil pressure gauge too far so that it sticks. (They didn't need to touch the OP gauge - maybe they leant on it by mistake.)

I'd make contact with club members in the area and find someone who can help you sort it out - it shouldn't be too difficult. You can find instructions on miata.net (garage) for fitting coloured dial faces - same procedure. (1/01)