How To Convert From An Idiot Light Instrument Cluster To A Gauge Instrument Cluster

Contributors:  Xtremeclonedss, 80 Mich Bu and Malibuplotter

If you would like to change out your plain speedo and cluster to a cluster with a round speedo and tach, there is no need to remove your wire harness, this is a painless procedure! No need to pass any additional wires through to the engine compartment!  See below for simple instructions:

1.Remove cluster bezel and don’t forget the 4 screws on the bottom and 2 on the sides
2.Remove cluster lens and “PRNDL” indicator.  Carefully remove the push-on “PRNDL” cable from the column shroud.
3.Remove the cluster.  The cluster connector will stay with the dash pad
4.Using a very small screw driver, release each wire one at a time from the long speedo plug and place it in the correct numbered position on the plug for the round guages.  Going from the long speedo to the round speedo you will have two wires left over. I just taped them so to not cause any grounding problems and left them alone out of the plug.
5.Now put them back according to the diagram (below) marked “Round Speedo With Gauges”.
6.OK, you’re done inside the car.  Re-install the gauge cluster onto your dash pad.
7.Remove the brown wire from your alternator.  If you have a cluster WITHOUT a tach, just coil it up and tape somewhere under the hood – DO NOT CUT IT OFF!
8.If you DO have a cluster with a tach, I recommend tach filter (GM# 14062505) from any GM dealership or off any Cutlass, Monte Carlo, Regal, El Camino or Bonneville (1978-1988) at a junk yard.
9.Change your water temp and oil pressure sending units (for gauges).  You can get them off the above mentioned cars in a junkyard or a GM dealer.
10.Amp gauge is already OK
11.You’re done!!

LONG SPEEDO WITH IDIOT LIGHTS

1 ORANGE
HORN, DOME, CIGAR 
18 GRAY
CLUSTER LIGHTS
2 YELLOW
SEAT BELT LIGHT 
17 TAN
OIL LIGHT 
3 DARK GREEN
TEMP LIGHT 
16 TAN W/WHITE
LOW BRAKE LIGHT
4 BLANK15 PINK W/BLACK
IGN / ACC TEST 
5 PINK W/BLACK
IGNITION HOT
14 BROWN
ALT LIGHT 
6 PINK
FUEL SENDER 
13 DARK BLUE
RIGHT TURN SIGNAL
7 LIGHT BLUE
LEFT TURN INDICATOR 
12 BLACK
GROUND
8 LIGHT GREEN
HIGH BEAM 
11
9 GRAY
CLUSTER LIGHTS 
10

ROUND SPEEDO WITH GAUGES

18 ORANGE
CLOCK 
1 BLANK
17 WHITE
TACH / DISTRIBUTOR
2 TAN
OIL GAUGE 
16 PINK W/BLACK
POWER ALL GAUGES
3 DARK GREEN
TEMP GAUGE 
15 TAN W/WHITE
BRAKE LOW LIGHT 
4 PINK
FUEL GAUGE 
14 DARK GREEN W/WHITECHOKE5 GRAY
ILLUMINATION 
13 YELLOW
SEAT BELT
6 LIGHT BLUE
LEFT TURN INDICATOR 
12 LIGHT GREEN
BRIGHT BEAM INDICATOR 
7 BLANK 
11 PINK W/BLACK
IGN / ACC TEST 
8 DARK BLUE
RIGHT TURN INDICATOR
10 9 BLACK
GROUND 
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