creating a new cluster speedo background and calibrating

[a_ahmed]

Hey guys,

So, I've got a spare broken speedo that I've got to play with. I disassembled it and wanted to figure out a number of things. I know where the pot for calibrating the speedo is located, I also know the resistor mod to make the thing even 399km/hr capable (useless but none the less...)

Now I scanned in the speedo backdrop, prepped it so I can make my own but I have a curious dilemma.

I may sound as a noob but I honestly don't know. On some car's speedos the distance between the ticks is not consistent between the initial 0-10 and the rest. As I observed the stock 0-180km speedo, the 10km incremenets are all consistent and the thick bold jumps are 20km increments, all that is equidistant except the initial 0-10 which is small.

I've noticed on the euro 0-240, the nismo 0-260 and the tomei 0-280 that the 0-10 is tiny and almost inexistant. Now I could just guesswork and make the distnace between 0-10 tiny and then do the rest equidistantly (not an issue).

However this inital 0-10 is a prob for me... I am sounding completely noob but I don't even know why the initial 0-10 would be smaller. On some cars the 0-10 is equidistant with the subsequent 10km incremenets... but not on some cars and well in our case, yes on our cars.

Here's my scan of 0-180km JDM speedo backdrop (I cleaned it up a bit):

Edit: It seems the forum squeezes and badly scales down the picture, so it looks a bit pixely... sorry about that, but what I'm talking about is still visible.

[jdm_master_X]

ive yet to figure out how to calibrate the needle to read correctly on its face. i did that trick from Zeroyon where you increase the resistance on the potentiometer to read from KM/h to MPH. if you ever figure out how to convert the JDM face for 180 mph or 300 KM/h, let me know. i have spare speedo as well. good luck!

[a_ahmed]

Well my question might have not sounded clear and may as well be noobish silly... but I was speaking about the initial 0-10 and its significance in relation to the rest...

Here is a Euro 0-240 cluster:



Notice how the intial 0-10km is much smaller than my scan of the JDM 0-180 (or even the USDM 180km speedo).

The tomei and nismo ones also had a smaller 0-10km space...

Now I am not sure what the relation of this is to the rest... if that 0-10 was STATIC... and insignificant, then I could just print out the 10-20, 20-30, etc... until whatever value I want (say 220, 240, 260, 280, 300, 320). However the 0-10 DID change. Do you notice the difference.

This is my dilemma first.. because if I make a RUBBISH backdrop, that no matte what u cant get to calibrate due to the initial 0-10.. its useless... if I'm making sense do you get what I mean?

I want to know the significance of why the intial 0-10 is smaller than the rest, to find out its relation to the rest (as it seems its not static as the euro, nismo and tomei ones are much smaller)

Don't get confused by the blank 10-20, the 0-10 is still smaller, the 10-20 is equidistant to the 20-30, etc... Here is a Tomei 0-280 speedo:

And I don't have a better pic of the Nismo 0-260 unfortunately although I did have one before...:

[jdm_master_X]

oh okay i see what you are saying. for that i do not know. i think you would be the first to ask.

good luck anyway!