sorry but a bicycle pump really won't work at all , you can pump up your shocks but by the time you take the hose off and then checked them with a gauge the shocks hold so little air you have let out most of what you put in , you need a hand pump for this purpose like a progressive pump or something like it , they have a built in gauge and a zero loss valve , if you use any thing else you are just guessing

 

I have only ever used a bicycle pump on my 1990 forks! Had the bike from new. It is true it ain't perfect, but it does work. Twenty years ago the 'proper' pump was very expensive and the same cheap short bicycle pump has worked well to this day.

 

The service manual says max is 20 psi. 4 to 8Psi riders up to 150 lbs each 25lbs over add 2 psi. Ithought the progressive springs allow for the anti dive so you wouldn't need the system. Plus the solenoid is prob not working right my 92 wasn't but who knows. How do you like the progressive springs are they lowered? If so whatsthe lenght and can I see a pic ofhow the bike looks? Thanks and I hope that helps

 

Also as far as I know the anti dive system is different from the air shocks in thebck of touring bikes. The anti dive system just moves air from the handle bars in to the forks during front brakeing to keep the front end from squating so much. I think spring tech improved to help with dive and now we don't see the system on bikes today. I've got two bikes with this system I'm by passing it on my fxr and taking all the parts off and selling them if you need any and my Electra glide has a Leak somewhere in the system and it effects the ride so little that I don't care to fix it. I think that's all I know about the anti dive

 

While riding along the air in the forks and bars provides extra springing and some adjustment for extra weight. When the front brake is used the solenoid closes off the air in the bars, reduces the volume of air to what is in the forks and so stiffens them up to reduce dive. I don't see any reason why it cannot be used with after-market springs.

Harley forks are so crude they should have been replaced decades ago! Later ones may be a little better. There are lots of sticking plasters out there to patch them up, but very little that makes them good enough to remove the air!