maybe some more details would help.. useually you run guages to w/e they are for.. oil/volts/boost. If you talking about a power or a ground.. I run my power out of the fuse box.. and i ground it out to the frame of the dash..
i just did the volts today i ran the volt to the under dash and grounded out somewhere and the light to the defrost light and grounded out. im going to do tranny temp for fun and maybe oil where you hook those up?