Chevrolet Impala SS, Handbook

Page: 83 / 159

83
SSHandbook
Modifications: Electrical
Radio Wiring Chart
Tachometer
Advantages
Installing the tachometer allows you to monitor engine RPM, a feature that is sorely missed by some 94-
95 owners. Other gauges can be installed in '96 models to monitor oil pressure or voltage levels.
Disadvantages
You have to install a non-factory gauge in the interior of the car. It requires some cutting of (replaceable)
interior pieces.
Materials:
• Replacement black dashboard instrument cluster bezel (P/N ???). Optional, but good insurance. About
$15.
• A 2 1/16" tachometer. No matter what you get, make sure it is at most 2 1/16" wide and no deeper than 3
1/2".
• 18 gauge wire and a length of black ribbed wiring conduit. About $5.
• Soldering iron or some other method of splicing.
10 9 8 7 6 5 4 3 2 1
20 19 18 17 - - - - - -
Harness side pin out.
Metra 71-1858, wiring harness side. (Receptacle)
1 2 3 4 5 6 7 8 9 10
- - - - - - 17 18 19 20
Radio side pin out.
Metra 70-1858, radio harness side. (Plug)
Slot: Color: Purpose:
1 Lt Gray Left Front Speaker (Neg.)
2 Tan Left Front Speaker (Pos.)
3 Lt Green Right Front Speaker (Neg.)
4 Dk Green Right Front Speaker (Pos.)
5 Black Ground
6 N/A Not Used
7 Gray Illumination Dimmer Control
Slot: Color: Purpose:
8 Pink (Green) Antenna Power
9 Yellow Ignition 12v switched
10 Orange 12v constant battery
17 Lt Blue Right Rear Speaker (Neg.)
18 Dk Blue Right Rear Speaker (Pos.)
19 Yellow Left Rear Speaker (Neg.)
20 Brown Left Rear Speaker (Pos.)