I just finished installing 2 hydraulic gages.   I was replacing all flex hyd lines with new, so it wasn't hard to include a T in the up line and down line located under the passenger seat.  Made an aluminum add on mini panel that goes between pilot's legs and straddles my flap switch.   Ran 2 four foot lines to back of gages.   All works great on several gear swings, but no operational/environmental experience yet.  

I definitely wanted the gages where I could see them for any diagnosis, and the panel was full of 1000 steam gages already.

Gages are number 9780T221 from McMaster-Carr for a low $21.48 each.   These are liquid filled with silicon (-40 deg F to 158deg F).  Entire operation cost less than $100.

I'll forward a picture in day or so.

Jack Addison    jraddison@msn.com

IO360 high comp