Can somebody tell an idiot like myself how to test a fuel pressure gauge and sending unit?

These are brand new electrical units that were working on the last run......got home, fired it up on the hose and no reading on the gauge, checked all the physical connections and they look fine.

The sending unit is a single wire style that is plumbed into the fuel regulator, how do I test that it is working? I have a volt/ohm meter just not sure how to test???

Same with the gauge, new Hardin Marine gauge, just not sure which posts to test and how...??

Thanks for any info in laymans terms.....

mine did the same thing !!!! i took a wire and ground it and took the other end and a hose clamp to it and it works fine now

Helpful, thanks...anybody else....??