i went to autozone and bought a multimeter.
then i read around the board some more and found some people with similar problems. see here....https://www.yotatech.com/f116/bad-ecu-185256/
so i checked the gauge fuse and it appeared good, i took the dash all apart and checked the bulb just to be sure and it was fine.
Then i checked the W wire. The FSM says to make sure the "batt" plug on the ECU says 11v. mine read 0. so i checked the battery directly under the hood and got like 12.5-14.
going on, i checked the W wire port and got 0.
im not sure if maybe im not measuring this right (because this is the first time ive used a multimeter). These were my steps....
1. put key in ignition and turn truck to "on" (but not start).
2. put multimeter (innova 3306) to DC Volts (20...i think).
3. put negative cable to a wrench i had next to me.
4. put the positive wire in the W port squishing it in to try and reach a contact.
and thats how i got my 0 reading. actually...sometimes it reads negative and then moves to 0.
any help will do. just trying to see if my ECU is just bad...or if im just using this machine wrong.