1991 electric suburban gauges into a square ls swap

[chuychevy82lwb]

Ok guys for some reson i cant find how to post on to the ls swap portion do bare with me . Long story short i have a 82 square swaped with a 5.3 /4l60e, and i just picked up a set of 91 electical speedo burban gauges from the scrap yard (20 bucks sweet deal huh guys ).now ive read and researched high and low and cant find a solid answer how tobi hook this gauges up to make them to work. i read ablut repining but i dnt know what to repin to where. i have at least 5 inch of the suburban gauge connector? so doni repin my 82 connector to match the suburban connector any bit of info helps

[Tilt]

The 91 guage cluster pinout diagram is on here somewhere if you search for it. On my 86, there were only 4 or 5 wires that needed to be swapped around in the plug. A very small flat head screwdriver is all you need to remove the connectors from the plug.

[chuychevy82lwb]

Thanks man ,ill look again quick question do i try to make my 82 square harness match the suburban ?

[lowrodderchev]

Man you lucked out on those gauges everytime I find a 91 suburban rye gauges are missing

[chuychevy82lwb]

I know ive been going to the pick and pull every sunday for the past 1 and a half months to see if i could a set because everytime i went they where always gone . Plus i wanted to maintain the factory look and also didnt want to drop a crazy amount on gauges
Ill try and look for another set next time i go and try to see if anyone on here needs them.

[lowrodderchev]

http://lt1swap.com/2004vortec_pcm.htm

This page help me alot

[chuychevy82lwb]

So i should use pin 50 off the green connector for the speedometer?

[bL.A.zer90045]

Putting these gauges from my 04 donor in one of my 78 c10's I'm gonna have to keep checking in on this thread and start stockpiling these 89-91 burban/k5 gauges for sale.are they just the 89-91,or will the 87 and 88 work as well?

[chuychevy82lwb]

Looks good from the little info that i have ita just the 89-91 burban gauges.

[foamypirate]

Here is some info that might help. You'll need to confirm your original pinout.


88’/87' Cluster Pinout
Pin # - Function – Wire Color
1 – High Beam Indicator – Light Green
2 – 12v+ for gauge illumination (headlight switch) - Gray
3 - Volt Gauge Ground – Black
4 - Volt Gauge 12v+ - Pink/Black
5 – Oil Pressure Signal - Brown
6 – Ignition Switched 12v+ - Pink/Black
7 – Fuel Gauge Signal - Pink (no contact on cluster for this pin)
8 – ground - Black (no contact on cluster for this pin)
9 – Coolant Temp Signal – Dark Green
10 – Ground – Black
11 – Left Blinker – Light Blue
12 – Right Blinker – Blue
13 – Seat Belt Light – Yellow
14 – Empty
15 – SES Ground – Brown/White
16 – Ignition Switched 12v+ - Pink/Black
17 – Park Brake – Dark Brown/White
18 – Fuel Gauge Signal - Pink


90' Cluster Pinout
1 - High Beam Indicator - Light Green
2 - Ground - Black
3 - Oil Pressure Gauge From Sender - Brown
4 - 12 Volt + Keyed From Ignition - Pink
5 - Low Voltage Warning Lamp - Dark Brown
6 - Not Used
7 - Not Used
8 - Coolant Temperature Gauge From Sender - Dark Green
9 - 12 Volt + Controlled By Headlight Switch - Light Gray
10 - Left Turn Signal Indicator - Light Blue
11 - Right Turn Signal Indicator - Dark Blue
12 - 4x4 Indicator Lamp - Empty on my 2wd Cluster
13 - Seat Belt Warning Lamp - Yellow
14 - Fuel Gauge From Sender - Pink
15 - Park Brake/Unequal Pressure Warning Lamp - Brown/White Stripe
16 - SES (Service Engine Soon) Lamp - Dark Brown/White Stripe
17 - 12 Volt + Keyed From Ignition Switch - Pink/Black Stripe
18 - Speedometer From Sender - Light Blue/Black Stripe


Repin Matrix (Pin # from 88' Cluster to new pin # on 90' Cluster)
i.e. "2 -> 9" would mean to move pin from position #2 into position #9
If New Location is "Removed" the wire is no longer needed and can be taped off

Wire Color / Original Location / New Location / Function

(Lt Green)..........1 -> 1...............High Beam
(Gray)...............2 -> 9...............12v+ from HL Switch
(Black)..............3 -> 2...............Ground
(Pink/Black).......4 -> 4...............12v+ Ignition Switched
(Brown).............5 -> 3...............Oil Pressure
(Pink/Black).......6 -> Remove......12v+ Ignition Switched
(Pink)................7 -> Remove.....Fuel Signal (Duplicate pin tied to the other fuel signal pin originally installed in location 18)
(Black)..............8 -> Remove.....Ground
(Dark Green)......9 -> 8..............Coolant Temperature
(Black).............10 -> Remove.....Ground
(Light Blue).......11 -> 10.............Left Blinker
(Blue)..............12 -> 11.............Right Blinker
(Yellow)...........13 -> 13.............Seatbelt Warning
14 ->.......................................Empty
(Brown/White)..15 -> 16.............SES Ground
(Pink/Black).....16 -> 17.............12v+ Ignition Switched
(Brown/White)..17 -> 15.............Park Brake
(Pink)..............18 -> 14.............Fuel Gauge Signal

[hatzie]

If the 1989-1991 GM schematics would help they are in my signature.

[chuychevy82lwb]

Thanks foamy i see your in Pflugerville im in taylor man

[foamypirate]

Originally Posted by chuychevy82lwb

Thanks foamy i see your in Pflugerville im in taylor man

Right on man! Always nice to know another truck guy in the area.

[656mx]

This is what I used for my crew cab.

[chuychevy82lwb]

One question foamy will the 88 cluater match my 82 ? To repin it according to the matrix

[foamypirate]

Originally Posted by chuychevy82lwb

One question foamy will the 88 cluater match my 82 ? To repin it according to the matrix

It should be fairly similar. You'll need to compare wire colors and pin positions.

[chuychevy82lwb]

Will do foamy. thanks guys i thought i was just going to have tp use a gps for the speedometer lol

[chuychevy82lwb]

Finally had time to repin my gauges i got the fuel and volta to work (waiting on parts for temp.and idk what to do for oil pressure yet ) but question to the guys that helped me out i see that slot 18 is now empty do i run the pcm(pin 50) wure straight to that spot for the speedo or do i have to splice into somewhere else ?

[hatzie]

Originally Posted by chuychevy82lwb

Finally had time to repin my gauges i got the fuel and volta to work (waiting on parts for temp.and idk what to do for oil pressure yet ) but question to the guys that helped me out i see that slot 18 is now empty do i run the pcm(pin 50) wure straight to that spot for the speedo or do i have to splice into somewhere else ?

I would give that a shot.

The "LS" PCM terminal 50 is a conditioned 4,000 (4K) pulses per mile DC square wave... http://lt1swap.com/2000harness.htm

The 1990 & 1991 wiring diagrams show a DRAC for the speedometer and cruise control. The T400 CK series DRAC outputs conditioned 4,000 (4K) pulses per mile DC square wave. I doubt GM made a special DRAC for the 1990 & 1991 R & V series light trucks.

[chuychevy82lwb]

So it worked so stoked just ran the pin from the pcm (pin50) straight to my c10 gauge harness number 18 with a soldered and heat shrunk leftover groud and boom i now have a speedo also the gauge cluater i got from the pick and pull had a sunpro tach and i made that work to0o the gmc gods are shinning upon me

[foamypirate]

Originally Posted by chuychevy82lwb

So it worked so stoked just ran the pin from the pcm (pin50) straight to my c10 gauge harness number 18 with a soldered and heat shrunk leftover groud and boom i now have a speedo also the gauge cluater i got from the pick and pull had a sunpro tach and i made that work to0o the gmc gods are shinning upon me

Right on man!

[656mx]

For oil pressure drill and tap the oil cooler plate and put the original sending unit there. Its right above the oil filter and pre drilled already.

[chuychevy82lwb]

Would you know what size bit and tap ot is ?

[656mx]

I think I drilled and tapped it for 1/4npt. Then used a bushing to get to 1/8npt. It's been a couple years since I did that.

[chuychevy82lwb]

Ill try that thanks for the help man