I had an OEM Delphi unit as a spare, it is now on the truck, I got it from Oregon Fuel Injection for $62 vs. $200+ for the LR branded OE part or ~$20 for white box.
The ignition switch thought is great as I have had an intermitted non-start when the key was turned. The glow plug light lit, the brake check relay clicked but the starter relay would not engage or seemed to do so weakly, not the loud 'clack' you'd expect. I checked/serviced all grounds, the ignition and feed connections to the (new) starter, etc. and all seemed fine. Guess I am looking at a new switch. Known to be a weak spot.
I also use the Stanadyne lubricity additive. Thx.
I am considering the 200tdi upgrade, however this is a newly rebuilt 2.5 and a good engine for what it is. Yes it is slow, but for this truck's use, it is adequate. The 3-4 trips to the Cape on 495 are slow, but not too bad..just time the trips and drive on. Heck, I actually passed a few cars the last time.
'85 90 2.5NA
'72 SIII 88"
Couple other cars