Caterpillar 3126, ECMs, (GOOD USED & BENCH TESTED) Caterpillar 3126 Part # 145 7807-00 ECM For Sale, 40-PIN ECM, 1WM Prefix, Part # 145 7807 00, 145780700, ENNDDK-NO, Off CAT 3126 40 PIN Engine ARR Part # 143-8599, ECM Serial # 26670214CB, Stock # 8097 | Tested & Inspected!