Bear in mind that you will need to rack the focuser inwards (shorten the distance between objective and the sensor) with real infinity focus vs focus in the daytime. If the drawtube does not have enough travel, you would need to reduce the spacers.
Just use the thin lens equation to estimate the amount.
From Googling, your scope has a native focal length of 480mm.
I had made up a bunch of tables for my various OTAs, and this is the closest focal length to yours ("90FL" is the Borg 90mm fluorite objective):
So, if you are daytime focused to a tree 100m away, infinity focus will need to be about 2.5mm shorter. If you are daytime focused to something 50m away, infinity focus would need to be about 5mm shorter, etc.
I don't know the precise EAF scale of your rack and pinion focuser. It could be in the region of 4 µm to 6 µm per EAF step (you can easily determine by moving the EAF by say 1000 steps to 10000 steps and then measure the change in the drawtube distance). This will give you an idea how many EAF steps will be needed to change from your daytime to nighttime focus.
Good luck, and good job with the daytime success.
Chen