Speedometer Miles into KM

I think you are looking for a "Speedo" (tach is engine revs). The Euro speedometers are not widely available but can be found. You might have some luck with Rolland in Germany. It's not as simple as just changing the speedometer face, you also require a different reduction gear for the ZF where the speedo cable is attached.

Good luck.

Mark

Maybe- if you're lucky. There are two different ratio speedo units and two mechanically different right angle gear-drives back on the ZF. Lettered on the back of the speedo case in green ink will be either '1210 giro' or '1610 giro' denoting the number of revs per mile the instrument uses. The right angle drives can be either VDO or Borlotti and their threaded nut sizes vary, requiring a matching speedo cable. Their ratios are stamped on the blind end of the angle drive.

Possibly an easier, cheaper and less potentially confusing solution than changing speedos is to find a local speedo shop that will simply change your current instrument's face from mph to kph. As can be seen from the previous post photo, the metric face also has the mph values on an inner circle, so a shop may also be able to make one for you.

i had the same doubts for tech inspection in Belgium with my MPH speedo. But they didn't take notice of it.

Otherwise my plan was to let make simply a sticker with KMH on a inner or outer ring which i could put on the speedo glass.A bit imitating the ones that exist as in Andy's car.

Mine is only marked in KM ... since I'm in the US ... while driving I have to do the conversion in my head while driving ... LOL

Just purchased one on Ebay. These are the numbers in back. It's off a 71. Also have one with dual scale. Try at rs modena.

I also had to have Km on my speedometer here in Norway. So I had a new dial made with Km scale, but since the original is 200MPH the new one is 320KPH!

Does the odometer turn in miles, or KMs? I would expect it's miles if you just re-lettered the face. Observers would assume it is kilometres, in which case the car has now travelled 37% less distance, and will continue to do so from now on. However your observed fuel consumption per "indicated km" will be terrible!

Mark

Thanks all for your interesting comments. I did not know yet the RS Modena shop. I will probably buy a new speedometer in that shop. I also need to change the back indicator lights from red to orange. Do I need to change the complete aft light elements?
Greetings from South of France

Hartwig

If the starting point of the speedo and ending point are at the same places on the dial, all you need to do is make the conversion on the face of the dial like Tunnelport492 did. You won't need to use an adapter gear. The adaption is in the correct graduation of the markings on the dial.

The speedometer is disassemblable and the the needle and face plate are easily removed and then reinstalled.

You just pull off the indicator needle with you fingers. Then remove the two screws in the faceplate. Then reverse the process to reassemble.

The chrome rim and glass come off by bending the tabs on the chrome rim carefully, then reversing the process.

It's no big deal. You don't even need a shop to do it. You can do it all at your desk. I did. No problems at all. Lets you clean the inside of the glass cover then.

Make sure you clean off all your fingerprints before you reassemble it.

My chance I found someone in France selling both complete back lights (new) for 180 Euros. Seems to be a good deal.....
Brgds

Hartwig

quote:

Originally posted by SIG:
My chance I found someone in France selling both complete back lights (new) for 180 Euros. Seems to be a good deal.....
Brgds

Hartwig

Hello Sig, I have pantera 3840, it has a KM speedometer, and I need a Miles speedometer,

could we do an exchange? best regards Peter,

0044 161 494 5047 of fenlon7@gmail.com

Hi Peter,
as Doug said its a pretty easy job to swap the faceplates. If you and Sig do not end up doing a swap, I have a miles only faceplate which I would be happy to swap, or the entire speedo for a 74 if you prefer. I am not sure of the ratio but could check it tomorrow.

As an aside Tara McGill often sells km faceplates.

regards
Peter

quote:

Originally posted by Oz longchamp and pantera:
Hi Peter,
as Doug said its a pretty easy job to swap the faceplates. If you and Sig do not end up doing a swap, I have a miles only faceplate which I would be happy to swap, or the entire speedo for a 74 if you prefer. I am not sure of the ratio but could check it tomorrow.



As an aside Tara McGill often sells km faceplates.

Hello Peter, I haven't heard from Stig but a german owner has asked for an exchange, I have 186 176 and 2H in black ink on the rear of my speedometer, and have no idea regarding the ratio it denotes, to my shame I also don't know who Tara McGill is?? Help

regards Peter

regards
Peter

Hi Peter,

The photo by Ducatista on the 1st page of posts shows the rear of a speedo with text 1610 revs/mi. According to Bosswrench it can also say 1610 Giro or 1210 Giro, which are the 2 relevant ratios.

If you just swap faceplates then it does not matter.

I will PM you Tara's email address. She sells all sorts of NOS items on ebay.

regards
Peter

quote:

to my shame I also don't know who Tara McGill is?? Help

Tara is Gary Hall's grand daughter. Working full time at the shop in Paramount.

quote:

Originally posted by desert_detomaso:

quote:

to my shame I also don't know who Tara McGill is?? Help

Tara is Gary Hall's grand daughter. Working full time at the shop in Paramount.

Thank you for the info, I now recall the name having asked some questions to Hall regarding a radiator and stainless water piping I bought from them and MD kindly shipped to England for me.

As for the speedo I have a solution and am to exchange mine for a MPH one with a Pantera owner from Germany, grand forum, and thanks to all for information.

Peter,

To get a correct reading you will most likely have to change the angle drive gear on the ZF, they come in two variants a 1.1:1 and 1:1.

I know everyone says just change the faceplates, but my GT5 was a Euro car with changed faceplate and was well over 10% out until I did the angle drive. The way you are going is the best as a changed faceplate alone speedo will still rack up at the rate of miles on the odometer not Kms.

Julian

Hi Julian,
thks for your advice concerning the angle drive unit!!! Peter and me will check out everything and report!
Wolfgang

Hello all,

Thanks for all this valuable information. The remaining question is where to buy the different angle drives?
Brgds

Hartwig

Hartwig,
you can get one type of angle drive at rs corse in modena. Pls see their webshop on:
http://www.rscorse.com/shop-on...nal-de-tomaso-parts/
You maybe could also ask for the other types, too.
Wolfgang

Hello all,
after having finished our speedo swap both Peter and me are very happy with the results. Just a short report:
Attached pls find a table of the contemporary De Tomaso parts catalogue. Based on this table (64) we found out that both of us have Borletti and not VDO driving gears. The Borletti driving gear comes in two ratios. One is marked 50-0804 and the other 50-0806. My gearbox is a 1031002001. My angle drive is marked 50-0804, so it is the 1 Rev = 1 m type. Peter´s angle drive is marked 050-0806, so 1 Rev = 1,36 m. So we knew that we had to swap the angle drives, too. After doing that the speedos work perfectly and show the mls/kms they should...
Wolfgang

Some photos of the speedos:

one more:

last one of my former speedo in peter´s fantastic euro gts-dashboard:

From an initial enquiry to ask for an exchange of
odometers, I must say that the advice from people on the forum has been a great help.

Also I would like to thank Wolfgang who did all the hard work in road testing, finding an expert to correct a small problem in my speedometer at a very reasonable cost, and the trust involved in the exchange of valuable parts, when we have never met or know about one another.

The De Tomaso community seems a very nice place to belong to.

Thanks to everyone, Pete.