New AOS same problem

[flmont]

I get the Manometer that Maytag suggested,..But Iam Not sure if I hooked it up correctly,..I set it to INH2O used the RHand prong and it shows ( - 1.47 ) cold ,.I know its suppose to be at operating Temp,.but Iam checking to see if I even hooked it up correctly,.....oil cap drilled with a brass fitting that I epoxied into place,.and then attached a 3/16 tube that was supplied..?? Thanks Frank