Having a tuned motor under the hood is cool. Having a server rack full of electrical gizmos in the cabin to control the tuned motor is cooler than Fonzie on ice. Gadgets are a way to purposefully floss what you got. It's the difference between James Bond using a cellie to control his 7-Series or a plastic-framed Etch-A-Sketch. Both work, but only one can pull the firme heinas quicker than Speedy Gonzales on an iPod loaded with Rock en Espaol. Arriba, arriba! Andale, andale!
Andale-ing on, the following is a semi-categorized list of cool shite that either reads your car's parameters, controls stuff, upgrades your ECU or sparks up the ignition. In other words, more fun with electrical pulses than a battery-operated harikata (isn't that technically a vibrator? - RC).
 Who: AC Autotechnic What:...  Who: AC Autotechnic What: GR-5000 60mm gauges Wallet: $76 and up Where: acautotechnic 626.812.8233 |  Who: AC Autotechnic What:...  Who: AC Autotechnic What: S7 Titanium gauges Wallet: $64 and up Where: acautotechnic 626.812.8233 |  Who: AC Autotechnic What:...  Who: AC Autotechnic What: GR-5100 S7 Tachometer Wallet: $144 Where: acautotechnic 626.812.8233 |
 Who: AEM What: Digital display...  Who: AEM What: Digital display gauges Wallet: $140 and up Where: aempower 310.484.2322 |  Who: AEM What: Universal...  Who: AEM What: Universal sensors Wallet: $205 and up Where: aempower 310.484.2322 |  Who: AEM What: Serial Datastream...  Who: AEM What: Serial Datastream gauge Wallet: $382 Where: aempower 310.484.2322 |
 Who: FJO Racing Products ...  Who: FJO Racing Products What: Digital racing gauges Wallet: $138 Where: alamomotorsports 800.880.0960 |  Who: AEM What: Gauge-type...  Who: AEM What: Gauge-type wideband UEGO controller Wallet: $416 Where: aempower 310.484.2322 |  Who: AEM What: Thermocouple...  Who: AEM What: Thermocouple amplifier Wallet: $415 Where: aempower 310.484.2322 |
 Who: A'PEXi What: EL2 System...  Who: A'PEXi What: EL2 System meters Wallet: $219 Where: apexi-usa |  Who: FJO Racing Products ...  Who: FJO Racing Products What: Air/Fuel Ratio Analysis system Wallet: $199 and up Where: alamomotorsports 800.880.0960 |  Who: A'PEXi What: DECS tachometer...  Who: A'PEXi What: DECS tachometer Wallet: $399 Where: apexi-usa |
 Who: Tein What: Defi-Link...  Who: Tein What: Defi-Link Meter gauges Wallet: $182 and up Where: tein |  Who: Tein What: DIN-Gauge...  Who: Tein What: DIN-Gauge cluster Wallet: $587 Where: tein |  Who: Tein What: Defi-Link...  Who: Tein What: Defi-Link display Wallet: $320 Where: tein |
 Who: Tein What: Defi Control...  Who: Tein What: Defi Control Unit II Wallet: $115 Where: tein |  Who: Zero1000 USA What: Electronic...  Who: Zero1000 USA What: Electronic gauges Wallet: $138 and up Where: zero1000usa |  What's thick, black and easily...  What's thick, black and easily fits in my fist? Why, a gauge, silly. |