Originally Posted by bigbill
Vr4 is either o2#1 55 or o2#2 56
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This is the information I got from the website.
Any wideband O2 with a 0-5v output can be used.
The Innovate LC1 and AEM Uego are great examples of WBO2 sensors that work great with the Flash Ecus.
After following installation instructions for your choice sensor you will need to wire the 0-5V output (see your WBO2 sensor manual for wire color) into the ECU.
Wire the 0-5V into pin 93 for a 98-99 Flash Ecu, pin 55 for a 91-93 Flash Ecu or pin 77 for a 94-97 Flash Ecu.
Then just finish your sensor scaling in the rom and you are set up. Chromedecu.org | Sensor Scaling
See plug pinouts below. The diagrams show if you are looking directly at the ecu plug, or the back vehicle side plugs.
I got a PLX wideband and after reading the PDF file it says the 0-5V output is the GREY wire.
I just have to buy a 1st gen ECU Pin to solder the grey wire to the ECU pin 55.
I'm not sure if that's correct.