Why can't I install multiple engines on my car?

Game Talk The Bunker
1

I have all the requirements, but when I press enter, nothing happens.

2

In some versions (I think 0.8 is included) the extra required Mechanics skill isn’t displayed. If installing a second of the same engine (I think) it requires double the cost of the first one, then triple, and so on.

3

It’s like 10/12 mechanics for a second engine IIRC.

4

12 sounds right. For some reason I’m thinking 16 though, so if 12 doesn’t work, try that.

5

Thanks guys