It is my understanding that Detroit Diesel built engines with DDEC I from 1986-1989, DDEC II from 1988-1992 and DDEC III from 1992-1994.
A 1987 Newell, would most likely have DDEC I but it would depend on the date of engine manufacture. If the stickers are still on the valve covers, they should give the date of engine manufacture and identify if it is DDEC but will not identify which DDEC version. My 1992 Newell engine says "8V92 TA DDEC" "Manufactured July, 1990". According to Detroit Diesel mine is a DDEC II.
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