I now sell a small tach adapter, which will convert the 1990-style tach pulses to work with a 1991+ ECU! That's right, for only $30 your ECU swapping headaches are history. I've also developed a version to conveniently fit INSIDE the ECU, so the 1991+ ECU will go into your 1990 Turbo car plug-and-play!
BE SURE to tell me in your Paypal comments whether you want the INTERNAL or EXTERNAL version, both pictured below!
BE SURE your Paypal includes a good mailing address, as these go out First Class Mail.

Click here to order a tach adapter by Credit Card or Paypal
For instructions and pictures to install my INTERNAL Tach Adapter, click here.
For instructions on installing the EXTERNAL version, click here.
DON'T forget: Even if you use my tach adapter to fix the tach issue, you STILL need to swap pins 6 and 14 when using a 1991+ ECU in your 1990 DSM. That is a hardware isue that must be fixed by either swapping the two wires in the harness, or modifying the PC board internally, as shown on my INTERNAL instructions above.

External version:


Internal version:



Jeff Oberholtzer
http://www.dsmchips.com Please address any questions / comments to keydiver@yahoo.com

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