When upgrading to a Syvecs ECU, Chris Ludwig set me up w a convenient way to adjust boost & traction control. Additionally, I keep some universal USB cables + NOCO jump starter inside the glove box.

For my cubby bins behind the seats, I really dig the JP3 Motorsports accessory insert/pre-mix bottles for the passenger bin. And I have a small-ish AGM battery + circuit breaker + remote mount trickle charger located behind my seat.

 

Here is a pic of what was cut out for my problem back in 1993.

 

i figured you would appreciate this. I did this for a friend of mine a few years back