As the rest have said, French cleats. Divide the wall into regular sizes so you can make interchangeable pieces to fit on it. Maybe a peg board to hold your spanner or cut outs for a drill stand etc. Have big stuff at the bottom as it is heavy, smaller stuff at eye height swo you can find the bit you are looking for and a few more bigger ones at the top for stuff you don’t use so much.
This pic shows how you might divide the wall and you can swap the sections where they have the same letter. That way, if you are doing a lot of one thing, say wood work, you put all of those tools where they are mnost handy. Then when you swap to rebuilding the car, you move the woodwork tools further away and the car tools to the prime spots.
Here is a funny foreigner making one : https://www.youtube.com/watch?v=SoEzgVDmL2s