Diesels don't make vacuum, 50 psi of governor pressure is about 20 mph in a diesel and he already has O/D control in the pcm with a dash button to turn it off. I did find this adjustable fuel pressure switch at summit. Don't know how well it would hold up to ATF though. Summit pressure switchI remember having a hard time finding correct pressure switches and ended up actually talking to a Honeywell rep on the phone to get the correct part numbers. I don't remember where I purchased them from.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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