It shows more than just Dodges. It will show EVERY car in its database that uses that part. If you look up an oil filter or something common like that, you'll get a long list of all makes. If you only get other Dodges, then you can only find that box on those Dodges. (At least that part...
Partsamerica.com has a cool feature that lets you see what other vehicles a part is for. Look up your 98 Durango pump and then click that link. It will tell you what other years the same box was used on.
You can make sure its doing anything by just disconnecting it and seeing if your timing changes. Checking it's "calibration", for lack of a better term, would be much more complicated.
I've been hearing a bunch of complaints about bad gears on many brands of aftermarket HEI. Apparently they wipe out your cam...
CRT HEI cam gear question - JeepForum.com
A lawyer I met told me a similar story recently. Some lady made US MINT checks and cashed one for like $1500. He said the clerk should have known better since it was a goldfish pattern check! Anyway, she tried it again, but like many criminals, she got greedy. This one was for $2 trillion...
You can get a cheap ($10) replacement mirror at your local auto parts store. They sell one that has an arm on it, and you can just drop a bolt through the end of the arm and into your door hinge. Works well for a buddy of mine.
You might have disconnected the sensor or damaged it when changing the oil filter. Its right next to the filter. Check the wiring, then change out the sensor. When my 00 XJ started showing 0 psi a few months ago it was a bad sensor. It would just drop to 0 out of nowhere and come back to...