I have used a product called "PreLuber" since I built my roadster in 2001. This is an electrically operated pump that draws
oil from the
oil pan just like the
oil pump does, passes the oil through the oil filter and pressurizes the engine prior to startup. The system was easy to install and wire up and came with all the fittings needed. I have the lines plumbed into my sandwich style oil cooler adapter/thermostat fitting between the engine block and oil filter. It automatically operates when I turn the key to the ON position. The pump turns on and in a few seconds builds oil pressure. Then I start the motor. The pump operates for approximately 30-45 seconds and will provide up to around 45 lbs. of oil pressure. The PreLuber works every time I start up the engine and has worked flawlessly for me for 10 years now. I am partial to this unit over the vacuum operated AccuSump systems. Because of how this unit works, I have never had to pull a distributor, prime the system, etc. Even on initial firing of the new motor, the PreLuber built up oil pressure just fine. When changing the oil and installing a new filter, the PreLuber builds up good oil pressure before cranking the motor.
For anyone who is interested, here is the link to the manufacturer
http://www.pre-luber.com/