Harley-Davidson Oil Pressure


Shovels & Evos

Easy Horsepower gains by updating your oil pressure to Factory Harley specs. Our SP-1 WILL increase your oil pressure!!! To precisely set your oil pressure, use our PJ-2 Pro-Just!!!


Twin Cams

Realize REAL Performance gains in your Twin Cam engine by using our SP-TC!!! Installation without removing the Cam Plate made easy by using our TC-EZ!!!



Monitor the oil pressure on your Harley-Davidson with confidence!!! The Pro-Gauge is designed specifically for the harsh environment encountered by the air-cooled engine.

Harley-Davidson is What We Do

 Since 1990 E.R.T. Products, Inc. has provided American made performance motorcycle parts. 

We specialize in Increasing Harley oil pressure which cures noisy lifters & gains Horsepower!!!

Improve performance and quiet your engine at the same time!!!

From our Customers

Mike Kelley

I installed the Pro-Just on my Evo custom. It works like a dream. I have all the oil pressure I need now. It is a pleasure to finally buy something for a Harley that works. Thanks a lot for your help. I will be telling all the Harley guys that I know about your stuff!                                      

Randy Kain

The springs arrived today and all I can say is OMG! Before I changed the spring I had 4 lbs. of pressure at idle with a cold engine and 18 lbs. at 2500 rpm. When the engine warmed up I lost all pressure at idle with the red warning light on and the gauge showing 0 lbs and got 15 lbs at 55 mph. The engine also rattled and ticked at idle badly. I installed the blue spring and took it for a drive. I now have 12 lbs.at idle and 35 lbs at 55 mph or faster. I am amazed! This is for sure the best thing I've bought for my bike yet and I'll be telling any and everyone who'll listen about what your product did for my Harley!   

Dale Soderstrom

I recently received the PJ-2 Pro-Just from you. I just want to tell you that it does a great job of allowing me to contol the oil pressure on my 95 Road King. Up until now I had increased the oil pressure by adding a spacer above the stock spring. Although that did help it did not give me consistent oil pressure at both idle and higher RPM. I believe that was related to the spring rate not being what was needed. I am now consistently running 35 psi at speeds of 50 mph and above, idle pressure is around 14 psi. Just want to tell you I am pleased with the PJ-2. Great product!

Steven Byrom

The unit is great! And with the aid of the oil pressure gauge, I have brought up the oil pressure to the correct levels using the PJ-2. I can now ride in peace, knowing that the most vital part of my engine( most vital part of any engine, OIL ) is being fed to all the necessary moving parts. Thanx again for sending it.