I recommend an electric fuel pump. Also I would not get he Holley Red, I believe it is underpowered for diesels as the fuel is thicker density than gasoline. I recommend the Holley Blue minimum or Holley Black. Most people use the Facet 40222 which has great lift capabilities and can be mounted up top in the engine bay, very easy to access and great reliability. I have the Holley black and ran it to a relay. Ground the pump, then power supply hook to the battery with a Inline fuse. For activation of the relay a popular method is you can connect it to the red/green wire in the glow plug relay for key on power. I ran my activation power to a fuse in the cab with a switch Soni can turn the fuel pump on and off.
The reasons I am in favor as mentioned already of a E-fuel pump:
Reliability, the mechanic fuel pump eventually fails and is known to pump diesel into the crankcase in rare instances. E-fuel pump eliminates this.
Starting, the E-fuel pump automatically bleeds the lines pretty much with an air leak and makes starting a thousand times easier. Instead of cranking the engine until the batteries are dead it starts.
Efficiency, E-fuel pump has improved my mpg I believe as it can deliver more fuel to the IP better so it's never underpowered or sluggish.
Ease of access, installed on the frame or top engine bay. Never have to get at the old fuel mechanic fuel pump again.
Biofuel capability, old mechanical fuel pump has a hard time with thicker fuels. Holley Blue or Black can push that stuff easily. Whether it's WVO or WMO.
I am not an electronic guy, I delete as much electronics off my truck as I can or make simpler. Switching to an E-fuel pump though has too many advantages to be ignored though, and are better for me and my rig in terms of reliability and simplicity. Once the wiring is there never have to worry about it again and its a done deal.