I've used a scan gauge for several years and if is very useful. I have had to use the code function several times and it is nice to know what the code means and then be able to delete it and see if it comes back or whether it is a one shot deal. Also really good for your heavy foot on the accelerator. I mount mine on the dash to the left of the wheel so I have an easy view but it does not distract me.
I think that a dash cam is also an excellent idea. I just haven't bought one yet. Maybe before my next big trip this summer.
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