Help on nitrous install
also i dont know where to tap into for the rpm or tach signal for the progressive control...
From our supporting vendor, Robert56 website
"The factory tachometer output can be found on the Powertrain Control Module (PCM) found in the passenger tire well. The PCM has two 80 pin connectors, with the one closest to the firewall being called the "Blue" connector by GM. The other connector is called the "Red" connector. These connectors have a plastic hold down that snaps off, be careful.
The '99/04 use the "Red" 80 pin connector on the PCM and Pin #10, and a white wire.
These 80 pin connectors (red and blue) are attached to the PCM which can be found beneath the battery tray behind the passenger inner tire well. The inner tire well can be removed easily by removing the screws that hold it in position. "
Blue should be your TPS wire. Verify with a meter.













