[ChevyTech]

Here is what the DRAC models looks like from a TBI truck after they stopped building the DRAC into the instrument panel. I think they began using this part in mid year 1990, so some 1990s were built the old way and some the new way.



Link to photo source if photo won’t show
http://www.bigfloridacountry.com/drac1.JPG

I don’t believe you can buy a DRAC that is ready to use from a dealer an longer. Do to the number of DRAC modules because all the axle ratio and tire sizes making a difference in the signal output, they changed to a one fits all module that had to be sent out to get calibrated to fit the vehicle it was to be used in.

There are many articles on installing dip switches in the DRAC modules that were separate from the instrument panel. With dip switches you don't need to use a soldering iron to change the calibration.

Here some articles and sites look at:

http://www.tbichips.com/drac/

http://614streets.com/drac.html

http://www.asashop.org/autoinc/feb2004/mech.cfm