Here is what I did...

Following this schematic I bought an enclosure to house the circuit...



It's very simple to make the cable. My advice would be to test your setup using alligator clips and jumper wires to make sure it works before soldering anything - but its up to you...its a slam dunk job.

My pictures are attached...

Another note: Picture of plug....If you have access to a junk yard and are lucky I found a female plug that connects directly to the OBD port. It was in the wiring harness directly above the fuse box in a 93 TSi. It was hit or miss though...Some 93s had the needed '3x2' plug...others had the '2x2' plug which are no good. Luckily I was able to find 2 of 'em so no more issues with the connections coming loose during runs and or shorting out

The cable was built using parts found at any Radio Shack. In all I spent under $10 to make the cable...

I thought about doing a writ-up on this to replace the 'ghetto cable' thread found in this post: http://www.dsmtuners.com/forums/showthread.php?t=203316 Thoughts???

Props to you weaselhack. That looks awesome I would do a right up if I were you. Thanks for the great pics to. Man I can tear your car apart and put it back together(ASE certified mechanic for 10 years) but My circuit board skills suck. Can you give me some numbers from the board that you used. If not I can probably print the pics and they can figure it out at radioshack. Thanks again it looks awesome.

Alright guys getting ready to make the cable. Do I need 10-ohm resistors(1 watt 5%tolerance) or 10k-ohm 1/2 watt 5% tolerance?

91 Turbo Mitsu said:

Alright guys getting ready to make the cable. Do I need 10-ohm resistors(1 watt 5%tolerance) or 10k-ohm 1/2 watt 5% tolerance?

Click to expand...

here's what you need from radioshack:

part # 276-1122 (diodes)
part # 271-1126 (resistors)
part # 276-1538 (Crimp-Type D-Sub Connector *9 pin*)
female quick disconnects that work with 18 gauge cable
About 2 or more feet of 18 gauge copper cable
Any d-sub connector hood
electrical tape

that's all you should need to make a basic, cheap cable.

91 Turbo Mitsu said:

Alright guys getting ready to make the cable. Do I need 10-ohm resistors(1 watt 5%tolerance) or 10k-ohm 1/2 watt 5% tolerance?

Click to expand...

Yes...10k 1/2 watt or 10k 1/4 watt will work just fine. Happy logging

Thanks WeaselHack and THE REAL DEAL for all your help. I built the cable to WeaselHack's pictures and it looks great. I definitely need to work on my soldering skills(that was the hardest part for me)Hopefully it will work right . Thanks again guys and WeaselHack you should do a writ-up on your design. Travis

Thanks for the Kudos! When I have some time this weekend I will work on a complete write up for everything from making the logger cable to using the software and interpreting the logs. My only question would be - who/where do I submit it to once its complete?