I had a gear go bad on the odometer.  Took it apart after reading various posts and articles.  Only one gear appeared to be damaged/deteriorated, so I replaced just that gear.  Unfortunately, in the process of taking the bad gear out I decided that the speedo face had to be removed.  I now need to put the needle back on and I'd like to calibrate the speedometer with Karamba.

I need to know which pins do what on the back of the speedo. I reassembled it with the needle pointing to zero... not sure if that will be right or not. Has anyone else had to remove the needle and put it back? Is there a special procedure or process for this (it's a BMW after all)?

I've seen posts elsewhere that suggest I should find
12v+
sensor in
sensor out (wtf? really?)
ground.

I'm just not sure which direction is which and don't want to gamble or disassemble it far enough to get the board out for examination.

I really think it's +, sens, ground after looking at the connector.

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and here's how I hold the speedo assembly... a $28 vise from Amazon....
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Here ya are a schematic to ponder

interesting, makes it seem like ground, 12v, signal.

Knew I had it somewhere the big challeng is finding it on my contraption
Pinout for K Instruments
1 - Red/White - Clock Power (other stuff too)
2 - Yellow/White - Gear Position Switch
3 - Yellow/Black - Gear Position Switch
4 - Yellow/Blue - Gear Position Switch
5 - Black/Green - Starter Switch(12V if 2, 3 &4 are grounded - gear=0)
6 - Green/Black - Power
7 - White - Low fuel lamp
8 - Green/Yellow - ABS Warning Relay
9 - Blue - Alternator
10 - Violet/black - Temp relay
11 - Brown/Green - Oil light
12 - Violet/White - Choke indicator
13 - Brown - Ground
14 - White/Blue - Bulb monitor
15 - White - High beam
16 - Black/Blue - Tachometer
17 - Blue/Black - Right turn indicator
18 - Brown - Ground
19 - Blue/Red - Left turn indicator
20 - -
21 - Blue/Green - Turn signal cancel on flasher relay
22 - Yellow - Speed Sensor
23 - Brown - Ground
24 - Gray/Blue - Backlights

Hmm. 6 and 23 checkout...but the multimeter says 21 goes to the speedo. I will try again later. I couldn't get anything out of it with karamba. I was going to put it in the bike and try again.

Hmm. 6 and 23 checkout...but the multimeter says 21 goes to the speedo. I will try again later. I couldn't get anything out of it with karamba. I was going to put it in the bike and try again.

Karamba tutorial

About halfway down, RickG posted the pins for bench testing -- 6, 22, 23.

robmack wrote:Karamba tutorial

About halfway down, RickG posted the pins for bench testing -- 6, 22, 23.

I saw that... .and posted back that when I traced the pins with a multimeter 6 and 23 matched his recommendation, but 22 did not. I plan to recheck it, but thought it was odd. I'm not sure if the instrument cluster was original anyway. I thought I saw a date on it that was much newer than the bike.

This one can be found in the Download page



CF

Crazy Frog wrote:This one can be found in the Download page



CF

 i saw that one as well.  What are 21, 22, and 23?

I'm pretty sure that I zapped the speedo electronics because it wasn't working when I did my test ride today.... dammit.