What would be the most useful "4th" gauge to install?
I'm going to re-do the factory gauge panel with Auto Meters--after the oil psi, water temp, and volts, what do you think would be the wisest choice for a 4th gauge?
Vacuum gauge to better monitor the engine?
I had a transmission cook on me once, but only once, so a temp gauge for that would be useful.
I can't make up my mind on this one...
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