72fj here,i have a 99/f-550 in my shop,injector driver mod going bad,any of you know wear the idm unit is have not change too many of 7.3 computers but cant belive this truck has only one computer on d/side fire wall any info for idm location would be app.. thank you 72fj

 

PCM is mounted thru the fire wall on the drivers side below the master cylinder...

IDM is between the fender and inner fender liner. Remove the drivers side fender liner and you will see the IDM.

 

bingo,thank you first time to do a idm mod.thank you!!!!