This would only work for people with Navi, but, old Android phone + bluetooth OBD reader + torque app + aux video input in the storage area.
Also, with your Defi gauges, how did you deal with the dash resetting every time you turn off the car? I'm guessing something is wrong with the constant power. I tried a ton of different wiring combinations on the triple gauge harness and I couldn't fix the issue.
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Competition Clutch|Fast Intentions|Maxbore|NST|Setrab|Stillen|Tomei|Uprev| Z1
Avant Garde|SPC|Stance|Whiteline
Aerojacket|Seibon|Tanabe|TRS|TWM
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