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Hello! My friends are purchasing an 88 E350 and its in need of a GP controller, so we think. This is a super noob question but, the GP controller is mounted right in the center, above the front of the transmission?
A lot of things were moved around on the E series from where they were on the F series.
The F series has the glow plug controller mounted on the rear of the intake manifold right in the center.
If it is still where it was on the F series, it sounds like you have found it.