Back up instruments

[Juan M. Padrón]

Hello everybody.If anybody could give a piece of advice,I would really appreciate it.I had on my 337B an altimeter and a vacuum turn and slip as a back up.I sent them to overhaul and the turn and slip was discarded for having some radiation material and the altimeter is not worth to repair.My mechanic suggest an electric gyro horizon as a backup but so far what I've seen is that they cost aproximately 2000 $ a piece.Any suggestions what to do?Thanks a lot.