OK, I did finally buy that replacement model from coldfusionacparts
on eBay. It's exactly like the interdynamics part, except there is on IDQ branding in the gauge, and the end piece does not use a 90 degree connector, and it's way cheaper. I was hesitant to buy this one because I was thinking that maybe I would like the 90 degree end piece better, but now that I have used this eBay one, I think with it going straight in, it's actually better.
Revised eBay link for anyone else who wants one: