Tach: There are several WHITE/ black wires at the ECM....the one running to the front of the car should be the correct one.
Ignition switch wire harness: There isn't a lot of slack in the wires, and you'll be tempted to unplug the harness to stretch it a little. A co-worker of mine states that this will trigger the "check engine" light; do not unplug the harness.
Paying a professional to tap into the factory remotes will probably cost more than the price of simply paying extra for a combo remote start/alarm unit...I'd say it's not worth the hassle of messing around with the remote. But two layers of protection is always nice....you might consider doing a combo AND triggering the factory remotes.
As for everything else, this chart seems to be accurate:
| ITEM | WIRE COLOR |POL| WIRE LOCATION |
| 12V|red & orange |+ |ignition harness |
| STARTER|blue |+ |ignition harness |
| IGNITION|blue |+ |ignition harness |
| SECOND IGNITION|pink |+ |ignition harness |
| ACCESSORY|green |+ |ignition harness |
| POWER LOCK|yellow |- |DKP, white 22 pin plug |
| POWER UNLOCK|WHITE/ black |- |DKP, white 22 pin plug |
| LOCK MOTOR|gray | |DKP, white 22 pin plug |
| UNLOCK MOTOR|white | |DKP, white 22 pin plug |
| DISARM DEFEAT|no progressive unlck| | |
| PARKING LIGHTS +|GREEN/ orange | |fusebox, 15 pin plug |
| PARKING LIGHTS -|white | |headlight switch |
| HEADLIGHTS|gray/black |- |headlight switch |
| DOOR TRIGGER|yellow |- |fusebox, 8 pin plug |
| DOME SUPERVISION|use door trigger | | |
| TRUNK/HATCH PIN|BLACK/ orange |- |fusebox, 15 pin plug |
| HOOD PIN|pink |- |ETACS, 12 pin plug *2 |
| FCTRY ALARM ARM|factory remote only | | |
|FCTRY ALRM DISARM|factory remote only | | |
| DISARM NO UNLOCK|disarms w/rem. start| | |
| TACHOMETER|WHITE/ black | |ECM *3 |
| SPEED SENSE|brown | |data link connector *4 |
| BRAKE WIRE|GREEN/ black |+ |brake pedal switch |
| HORN TRIGGER|brown |- |steering column |
| WIPERS|white (L), orange(H)|- |steering column |
| LF WINDOW UP/DN|blue - brown |A |driver window switch |
| RF WINDOW UP/DN|gray - yellow |A |driver kick panel |
| LR WINDOW UP/DN|red - white |A |driver kick panel |
| RR WINDOW UP/DN|orange - pink |A |driver kick panel |
| SUN RF OPN/CLOSE|yel/red - yel/red |A |sunroof relay in roof |
| RADIO 12V|red |+ |radio |
| RADIO GROUND|black |- |radio |
| RADIO SWITCH|yellow |+ |radio |
| RADIO ILLUMINATE|GREEN/ orange |+ |radio |
| LF SPEAKER|white - brown | |radio |
| RF SPEAKER|yellow - black | |radio |
| LR SPEAKER|red - blue | |radio |
| RR SPEAKER|green - orange | |radio |
Notes:
*2 The ETACS module is attached to the back of the fusebox on the bottom. The hood pin is also green at the switch under the hood. *3 The ECM is under the center console to the right of the gas pedal. On the 2.4L with A/T it is in the 26 pin plug, the 2.4L with M/T it is in the 12 pin plug, and the 2.7L it is in the 40 pin plug. *4 The data link connector is to the right of the fusebox.