look at the new ones compared to an original one and it becomes very apparent why they don't work. I installed three new ones. One had the bourdon tube too big. It hit something in the gauge panel, and made the needle stick straight out, another didn't do anything, even another pulled the needle straight down into the face of the gauge and stuck there, it eventually moved, but it wasn't something I was going to pay what ever it was I paid for it. I eventually got an original from Pre-68 Dave, and that is working fine. It seems gauges that actually work are hard to come by. I went through 2 oil pressure gauges before I got one that didn't leak. But since virtually all vendors use the "counterpart" brand. That is what you are going to get. That one fella last week got an oil pressure gauge that is backwards. The best option if you want to spend the money is to send the originals off to someone to rebuild. I don't know of anyone right off hand but they are out there. And I mean the originals, don't send the new ones off to be refurbished, because the new ones are substantially inferior.