Married guys - car budgets and honesty

Again, she has no 'self', let alone hobbies she enjoys doing. She used to be into all sorts of things but life changed as we got older and for whatever reason, she let it all go.
That sounds like my wife. She has no "passion" for anything except the grandkids. Not trying to justify my actions, well, maybe I am, but the only disagreements we have are about money. If it was up to her, we'd be broke all the time, hence the separate accounts and the "not knowing" what I have. At my advancing years, our financial state is always on the forefront of my thoughts. Most especially retirement and "emergency savings". I have a set amount deposited in my personal savings account out of every check as well as contributions to my 401K plan. I never spend more than 50% of that savings account at a time on my personal desires so if I want to spend $1000 there has to be $2000 is savings. Our most recent argument revolves around my car. Transmission crapped out Friday so now looking at dropping a grand. She wants me to scrap "that piece of junk" and buy a used Honda or Toyota". Wants to know where I'm going to get the money for the transmission. When I tell her I have it covered in my savings she immediately starts looking for a new dining room set while just that morning she told she had a personal debt, $130, that was going to be put into collections. Last week she spent $190 on a tattoo to cover up a bad she had gotten 3 years ago. She has no thought toward finances or future expenses or savings goals. If I didn't plan and hoard we'd be destitute...but we'd have nice stuff!