PA39, Done the same in the old Apache (ECY) just after takeoff when I was training, certainly got the blood pressure going for a few seconds.

Been a long time since I've flown an Aztec, however I don't recall the fuel system being that complicated to operate. Only real problem I recall was some older PA23s only had one hydraulic pump I think on the left engine, hence if it failed after take off you would have to hand pump the gear and flaps up 😁😁, although I'm pretty sure the F model has pumps on both engines.

Aztec
 

Duck Pilot

Yes I remember the single hyd pump!! OMG what a nightmare. Great fun at night in IMC doing an approach!!! Enjoyed the E and F models who had the "optional" 2 pumps. Aztecs looked like a bulbous old bus but by gee great load carrier and good earner.

Agree the fuel management system was simple. They had a nitrogen bottle under the seat to blow the gear down too. Did it once....