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4D-454C is generally a turbo for an LDS-427-2 which I would describe as the appropriate OE multi-fuel engine for an A1 truck. Given how parts get mixed and matched over time, there's no guarantee on that.
The best flexible rubber fuel line replacement is Viton. The price can get scary in larger sizes. 4mm soft Viton is around $4 a foot. It's available from McMaster-Carr among others. It definitely outlasts standard fuel line for diesel.
These trucks are in the category of "If there aint't no oil under it, there ain't no oil in it."
Welcome to the insanity! I went for extra long insanity with an M36A2.
I've been buying VDO gauges that come with the matching sender. That way way i don't have to think too hard about it. Many of the VDO gauges are available in 24 volt versions or 12/24 volt version for the ones with LED lighting. The Viewline Onyx gauges are ~$60 with the matching sender and...
Have a look at this thread. Conversion to a civilian flasher. This will allow you to use an LED compatible unit that is way more reliable than the military ones.
https://www.steelsoldiers.com/showthread.php?134679-M-series-flasher-relay-civvy-conversion-how-to
The thermostat itself is an easy job. Not too hard to access. The real PITA is re-filling with the horizontal radiator cap. There are some really nice plastic funnel kits on E-Pay and Amazon that connect to the filler neck and make for much reduced swearing.