Vacuum test lower unit

[jackmanjls]

I have a yama 90 lower unit that I've replaced the seals. I did a pressure test and the connection at the lower oil input leaked with my setup. I used soap/water to verify the pressure. Assuming that the lower unit connection will still leak when I do the vacuum test what can I do to verify if there's seal vacuum leakage?

[Sequoiha]

Your going to have to repair the testing equipment to get an accurate test..