I used a 15V 800ma wall transformer on mine with an in line fuse for safety - I bet the 750ma will work fine.
Those solenoids are noisy on the desk - you'll hear it go "bump in the night" -
- (every few minutes). Use some rubber feet on the base - it's amazing how much sound the interior of the car absorbs.
Good luck - post a pic of yours when you get it done!!!!!