Married guys - car budgets and honesty

When I married my wife... she too is tight as crap with spending money (still still is) lol. At first it was hard for her to spend our money on my/our mopars. I then showed her the value of the cars and what they will be worth someday. Even the car parts that I buy today... I tell her what or how much in value they will be worth..let's say in ten years. It is like. 401 k plan but we can touch and drive them. She understands now and is usually the one that helps convince me to spend money on the cars because she know we can (if we had to) always get that money back.
PLUS. I am the sole provider and we have only been married for 7 years. I bought her a 69' barracuda convertable. This too helps.