Arnold E,
Yep! Two needle will do the job, but needle and drum with DC vibrators are available, or, if the aircraft has an inverter, the AC vibrator altimeters are a bit cheaper. If an altimeter is the only use for AC, small inverters cost pennies.
In the total cost of the airplane Sunny is building, the cost difference between crap instruments and good stuff will be sod all of the total.
My preference is because of the long history of misreading two/three needle altimeters - and they look nicer.
Tootle pip!!