Originally Posted by Dellis

I upgraded my '98 PCM to a later 411 PCM when my old PCM kicked the bucket during tuning after my supercharger install. I did the work right in my tuner's parking lot and the job took around 5 hours or so... I am in no way shape or form an electrician but will say my car started first crank after the install and there were no codes.

The links below got me started on the project:

General help: https://www.corvetteforum.com/forums...-corvette.html

About the fuel issue: https://www.corvetteforum.com/forums...cm-re-pin.html

I made up a spreadsheet with the '98 pin out diagram on the left side and corresponding '02 diagram on the right side. My diagram is attached to this post.
- Column B shows the old pin location.
- Column C is the circuit number.
- Column F is the new pin location. For instance, cell F7 means Blue connector, pin location 73.

I purchased 2 extra connectors to move the pins to. Basically I started with the first pin on the old red connector, which was pin 4 (circuit 633) and moved it to the new blue connector, pin 73.

As I moved the pin wire I labeled the wire with the circuit number. This ensured that if things got mixed up I could trace and fix. You see the beginning of the project in the picture I attached. After the first pin was moved I just went on to the next pin in line on the old connector, red 7, and moved that one.

For the fuel level issue just leave pin 44 on the blue connector unconnected. It basically kills the power to the fuel sending unit in the right tank. The link above gives more detail.

You will have a few other wires that you will not pin to the new connector... No worries, just tape these out of the way. The first link goes into detail about this.

Originally Posted by cadallante87

Think there is a typo on Blue 77, shouldn't that go to R15, not B15. Other than that, this write-up was extremely helpful. Thanks!