So, how about that engine breaking thing...
I was at one time considering a manual switch for my break lights. I do engine brake a lot, and some of that has to do with the condition of my brakes (but this isn't a thread about safe driving, just engine breaking, right?)
It seems like it would be good to use a switch that you have to hold on, so you can forget and leave it on.
On most cars it's a very simple wire to splice into. I've done it to set up a trailer break circuit. With some a/t cars this switch will signal a downshift.
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