Leaderboard

Makes sense, appreciate the feedback. I figured since there's a lot of things that could be related together it would help to keep it together. I'll try to break it down into at least related pieces. Thanks Ronnie!

Welcome to the forum! You have packed a lot into one post. That is OK, but I would recommend you start a new topic for each problem, beginning with the one that is most important to you, and work your way through each one until you have resolved the problem. That will avoid a lot of confusion. With one large post that has multiple problems it is hard to follow what is being said about each of the problems you listed as people start offering suggestions.

It looks like this is becoming a common problem where older parts are no longer stocked, but Rock Auto shows several choices yet. The sender was only used up until 1990 on the Reatta as newer models with the 3800 have a different operating pressure (higher).

Welcome. It looks like you have quite a job in front of you. Regarding photos; it sometimes helps to have a general overall photo with locations noted as well as the detail photos. I am just speaking for myself, but I do not have color codes and wiring configurations committed to memory🥴. That said, a couple of things are obvious and that is the area of the brake system in the engine bay has been converted to some sort of standard type brakes. The original anti-lock system is missing and the photo of the cluster of harness plugs is what used to plug into the motor and anti-lock module. You will probably have multiple warning lights related to brakes. I see the corner of what appears to be a cone type air inlet filter, and the sensor out in the open is probably the inlet air temperature, which is installed in the stock air filter housing. I do not know what is being referred to as an aftermarket MAF, but the photo appears to be the stock style setup with the protective loom covering missing from the last portion of the harness to the plug.