A real W126 DIYer would be a 1981-1985 300SD. Granted, it will not move as fast as a gasser, but there is literally half the relays and wiring involved.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section