I have a 98 F-body with 411 pcm. I'm running an aftermarket fuel cell and sending unit. I'm trying to get my fuel gauge to read correctly but it reads full all the time. After some searching, I found that I need to enable PWM and set it to 140.63 hz. So dumb question how do I enable PWM and set it to the 140.63. I can't seem to find and enable/disable setting anywhere.
Thanks