Received my Yong Heng compressor. Works great. Used it with my 45 Cal Winchester PCP. Went though a box of pellets in no time. Topped the pressure off each time after shooting the five round clip. With the hand pump I hardly wanted to shoot it. Put the manual recommended 46# Hydraulic Fluid. I've seen some post that say to use 30# synthetic compressor oil. Like to hear comments on that. But my main question right now is what batteries should I use in the temperature gauge? It came without batteries. (Shouldn't it come with them?) Been looking in Wal Mart. Hard to figure which to get just looking at them. Had a Watch I liked once that needed a new battery. Put one I had that would fit in and it never worked again. Also any one know that Max Temperature you should let it get to before shutting it down?