autometer gauge help

I have a oil pressure gauge and i don't know how to install it any tips or pics, i am tryng to install it in a civic 98 hb.......thanks

golden eagle sellls and oil filter adapter plater, if you get this it goes before your oil filter and it has to nipples on the side, screw on the adapter then the filter, then you can use either nipple and block off the other one, perfect if u wanna go turbo later