Originally Posted by 83

Part of this was posted by others over at the Marlin site, but I added to it & figure we could use our own swap thread over here in the pre-84 area. I think '79-81 trucks are different, but if you have an '82 or '83 with the "newer" style gauge, this will work.

**EDIT: The person who made this list came up with the numbers by counting every slot in the plug. The FSM numbers them differently because it only counts slots that have a wire in them, so don't try to compare the two or you'll get confused like I did!
It also seems better to use the wire #, as opposed to color, since some seem to be different. I'll post at the end of this thread what wire color I've got in what #slot. For that part I used the numbers from the FSM, not from this list below. Feel free to post here or PM me with any questions.

SR5----------Non-SR5---------Wire Color----Function

1<-----------------1-------------->GY------------>Right turn signal
2
3<-----------------3-------------->BR(B BR)------->Speed Sensor (-)
4<-----------------6-------------->GL------------->Speed Senson (+)
5
6
7<-----------------23------------->YG-------------->Water Temp
8<-----------------9-------------->RW-------------->Panel Lights (+)
9<----------------15-------------->YR--------------->Fuel Gauge
10<---------------12-------------->Y---------------->Ignition switch power
11<---------------21-------------->YB--------------->Oil Idiot Light
12<---------------22-------------->YW-------------->Charge Light
13<---------------14-------------->WB-------------->Ground
14<--------------------------------------------------Tach-must run a wire
15<---------------17----------------GB---------------Left Turn Signal
16----------------16----------------RB---------------Panel Lights (-)
17
18
19<---------------11---------------G-------------------4wd
20
21<---------------19---------------BY------------------Seat Belt
22
23<---------------13---------------RG------------------High Beam
24<---------------20---------------GW-----------------Brake

So if you get an SR5 cluster and simply plug it in to your truck, any of these wires that aren't the same number won't work. When I just plugged my cluster in, the right turn signal was all that worked. So you need to pull the wires from the corresponding number out of the plug and re-insert them into the SR5 location.


This shows what the back of the cluster looks like and the wire numbers. It also, if you can see it, shows you where the separate oil & volt cluster hooks in.



So to get the oil gauge & voltmeter working, you need to splice into the main cluster wires. You could get away with just splicing into hot wires here and there, but I liked doing it the way it would have been if it had been wired for it from the factory.

Back of gauges


Cut & labled


Connectors


My voltmeter ended up having some different wire colors than the FSM page listed, but they were all in the right location in the plug, so it was easy to figure out.
What I came up with after looking over the diagram is this, as far as what wires to tie the mini-cluster into:
Mini-------------Main
19 & 21(oil)---------->17
18 & 22-------------->6
21(volt) & 23--------->12
24------------------->Oil sending unit (SR5 model for GAUGE, not idiot light)
20------------------->Ground

Notice there is a #21 in each gauge for some reason.

If you want the oil idiot light and gauge to work, you need both sending units; one hooked up to the main cluster (switch), one hooked up to the new oil gauge (gauge). I just left the idiot light out..

Splicing into main cluster


Connecting to mini-cluster (I used 16 gauge wire)


I'll need to pull the part that connects the wire to the oil sending unit off a truck in a junk yard & splice it in, but for now I just have the wire wrapped around the sending unit and it works fine, but I'm guessing it'll eventually vibrate off if I leave it that way. That's it, mine works great.




***Here are my wire color locations (using the FSM slot #'s)

1___2___3___4___
G___BY__RG__GW

5___6___7___8___9___10___11___12
YR__Y___YB__G__WB__Tach_GB___RB

13___14___15___16___17
GY__Br____GL___YG__RW

Remember, B is black, Br is brown, L is blue.

Originally Posted by 83

I don't have time this week, but maybe Friday I'll post photos. There are two plugs that come off the coil. You just need to pick the right plug, and find the tach input on the back of the cluster and youre all set.

What year is your truck?

I have a photo in one of my albums of the wire coming out of the coil plug.

Originally Posted by 83

If you start counting from the bottom of my post you quoted...3rd photo up shows a blue wire stuffed into a slot in the plug for the back of the cluster.

Every other wire was pulled out of one location and moved to another location. The only wire I had to add was the tach. So that photo might help. It's showing the tach wire in the plug. But the actual numbered location is in this thread somewhere...