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Converting odometer from miles back to kilometres


Guest Cillian

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Guest Cillian

Hi all,

 

I have a J spec Supra that was first imported to the UK in 99, it was converted to read in MPH and the odo to read in Miles but now i have it registered in Ireland where we have Khms

 

I have since removed the restrictor / converter allowing the Speedo / speedometer to read in Km again, however i am a bit stumped when it comes to converting the odo back to km.

 

From the searches on here, there should be a pink wire that needs to be reconnected? Mine doesn't seem to have this wire.

 

What happens when you reconnect the pink wire, does it just automatically convert your 100km odo back to 62k miles? or just swaps the MILES part to KILOMETERS?

 

Is it possible someone was a bit lazy and just swapped my original J spec odo out for a UK spec one?

 

Has anyone successfully been able to adjust the mileage on their Supra if needed?

 

Thanks for any help!

 

Edit: just adding some search tags to help future users: clock, clocks, dial, convert, converting, speedo, conversion

Edited by Cillian
adding search tags (see edit history)
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I now have a UK mph speedometer, but back in the days when it had a converter, I found that swapping one wire changed it from recording in miles or kilometres.

 

I cannot remember what colour or where, just mix them about until it happens?

 

I have left mine in kilometers so there's no argy bargy by old wives about how many of thingy's it has done. :shrug:

Edited by David P (see edit history)
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What happens when you reconnect the pink wire, does it just automatically convert your 100km odo back to 62k miles? or just swaps the MILES part to KILOMETERS?

Assuming you have a JSpec odometer - readjusting the odo to count in kms will only affect the new distance you travel in the car. The odo is like a counter, which ticks up once for every mile or every kilometre (one or the other, not both!) it travels. It has no knowledge of what the current count means, or what units it's in.

 

This is why some people have an odo reading that they qualify by saying "the first xxx is in miles, then the next yyy is is kms" - personally I don't like that, it's opaque. But doing it properly costs a bit of money and you'd need someone to do it properly and document what they've done.

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Guest Cillian
I now have a UK mph speedometer, but back in the days when it had a converter, I found that swapping one wire changed it from recording in miles or kilometres.

 

I cannot remember what colour or where, just mix them about until it happens?

 

I have left mine in kilometers so there's no argy bargy by old wives about how many of thingy's it has done. :shrug:

 

Yeah thats what i am looking to do, just swap it back to KM. It was in the UK a long time but was a show car so it didn't do much mileage.

 

Can anyone share which wires need to be swapped?

 

Assuming you have a JSpec odometer - readjusting the odo to count in kms will only affect the new distance you travel in the car. The odo is like a counter, which ticks up once for every mile or every kilometre (one or the other, not both!) it travels. It has no knowledge of what the current count means, or what units it's in.

 

This is why some people have an odo reading that they qualify by saying "the first xxx is in miles, then the next yyy is is kms" - personally I don't like that, it's opaque. But doing it properly costs a bit of money and you'd need someone to do it properly and document what they've done.

 

Ah ok thank you for sharing that info. My guess is the car was just converted to read Miles when arrived in the UK and the actually distance wasn't adjusted as the interior wear matches the mileage currently on the car (92K)

 

Yeah to be honest i don't mind if the car has 92k or 920k i am just being fussy while resurrecting the car that i want everything to be correct.

 

Anyone else have any insight?

 

Perhaps pictures of the back side of a Jspec odo and a UK or euro spec one? thanks!

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Mine always has clocked up in KM, never been played around with so the mileage is 100% true, not x amount KM x amount miles. Had a converter just to adjust the speedometer.

 

I changed my J-Spec speedometer to a UK Spec so I could take out the converter as I didn't like having the loom cut into unnecessary.

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Guest Cillian
Mine always has clocked up in KM, never been played around with so the mileage is 100% true, not x amount KM x amount miles. Had a converter just to adjust the speedometer.

 

I changed my J-Spec speedometer to a UK Spec so I could take out the converter as I didn't like having the loom cut into unnecessary.

 

Good call, i would have done the same instead of messing about.

 

Can anyone please share what they did to swap from Miles to Km or vice versa? Surely this has been covered a few times before?

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