What late model accessories do you wish your old car had?

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I was thinking more of a "Real Time" reading. Like when you open the secondaries of your Thermoquad.
Oh I understand that completely, I was just giving MopaR&D a tip on mpg tracking.

I have a 75 Scamp that I plan on doing a full efi 5.9 Magnum swap on, including the fuel pump, rearend, od trans, gauge cluster, hvac from the ram. And while I’m doing all that, I’ll also probably utilize the readout display on the ceiling as well.