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Discussion Starter · #1 ·
I have an '86 4Runner, and want to know how hard would it be to replace my instrument cluster with that of a turbo's digital dash. Can it be done even though I don't have a turbo (yet anyway), or would it just be to much work to do?
 

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Cato,

First and foremost, the degree of difficulty involved in installing the digital dash is pretty much determined by your ability to read and interpret pinouts/schematics from the factory electrical wiring diagram specific for your truck and the digital dash to be installed. There is some variation in the wiring between 86 and 87 model year digital dashes, (2 additional pins on the 87) you would need to confirm this with the schematic diagram prior to beginning the installation.

Secondly, you would need to make sure you have all four of the digital dash plugs with several inches of wire attached as 3 of the 4 plugs are completely different from those used in the analog style (what you have). Assuming your truck has a working SR5 analog dash and you have the digital dash, plugs and wiring diagrams, you would do the following:

Sketch the existing factory plugs and the new digital dash plugs onto a piece of paper, placing the plugs for the old dash vertically on the left side and new dash vertically on the right side, carefully noting the corresponding pin locations and color of attached wires. Next, map out all the connections you will need to make by examining your sketches and comparing them to the pinouts in the book. Then draw all the connections between the two sketched plugs. Once you feel confident that you've mapped all connections from your existing connectors to your proposed connectors, carefully cut the wires from the existing analog dash plugs and graft the correct wire from the digital dash in place; soldering and shrink-wrapping each one before proceeding to the next. It would be a good idea to verify several of the pins in each plug prior to cutting them in order to confirm you aren't looking at them backwards. Some of the connections to the digital dash won't be present in the analog dash harness.. Specifically, the turbo boost pressure sensor wiring. You will need to run several wires seperately if you want the boost pressure portion of the dash to work. (A boost pressure transducer can be pirated from a turbo-equipped Supra 87-92 & located on igniter bracket adjacent to left strut tower)
If you have a non SR5 or carbed truck, you would also need to get an oil pressure sending unit in addition to the above and possibly, run a tach signal wire to the igniter for the tach to function.
It may seem time consuming and tedious, but if you want to install the digital dash, this would be the way to do it. Also, you may have trouble locating a digital dash as this was an expensive option and not many opted to shell out the $$$ for it. If on the other hand, you have a dash laying around, think this sounds like too much work and want to sell it to me, let me know and I'll take it off your hands <IMG SRC="smilies/smile.gif" border="0">

Will
 

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DAM dude are you a factory certifided toyota nut? J/K When i swaped in my 22rte i just use the factory sr5 cluster but i want to put in the turbo analog cluster( i have it) in but i thought i would have to run a wire from the out put of the turbo computer (the last wire on the right i think) to the insterment cluster, now how hard would it be to find, and install the digital dash in my truck? I think the digital dash only came i turbo 4runners? just wondering

Cliff
 

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Cliff,

Certified, yes. Nut, probably so. I too have a 22RTE that I swapped into my truck. Since my Runner is an 85 (SAS style) and was originally EFI, the swap was mostly straightforward. There are several differences in the instrument cluster wiring harness, though. The 85 and 86 EFI harnesses have very different pin configurations in the instrument cluster plugs. You need to know if you're using an 85 or 86 harness. Since I also wanted that cool 'TURBO' LED twinkling in my dash, my first thoughts were to rearrange all the pins in the instrument cluster plugs of my 85 harness to work with the 86 turbo dash. After considering the PITA factor, I opted to install only the Turbo tach containing the LED into my 85 SR5 dash and run the extra wire from the computer to the appropriate spot on the tach. I was able to wire the other LED terminal on the tach to the cluster itself. If you have an 86 harness in your vehicle it should only need one additional pin installed in position 4, plug A on your dash harness (the one going to SW-A on the back of the instrument cluster circuitry) and run to the ECU harness position 17, plug W. You can verify the differences, if any between the SR5 dash you're using and the Turbo SR5 dash by comparing the traces side by side and confirming connectivity through to the vehicle harness. It really helps to have access to factory electrical/service manuals when diagnosing/modifying electrical components. For a partial diagram of the ECU circuitry, check out Jeff Mosk's page- http://www.well.com/user/mosk/EFI1.htm.

The actual function of the Turbo LED on the analog dash is pretty crude though. Boost isn't measured real-time through any pressure transducer like the bar graph in the digital dash but instead the LED is illuminated during a condition where boost would likely be present. This condition is established in the ECU through an algorith performed by sampling and combining the RPM, TPS and AFM signals. LED illumination is even less accurate when you've upped the boost, tweaked the AFM and otherwise stymied the ECU.

I've only seen one 4Runner with a digital dash and, yes it was an 87 turbo/SR5 and, yuck, automatic! I suspect that's the only way they were offered. As far as finding one in the boneyard, good luck. I occasionally search for cool stuff 4Runner/Truck related in the p/p and I've yet to come across one with the digital dash. With regards to installing one in your truck, assuming it was originally EFI and has a working SR5 dash, it would be as simple, or complicated, based on experience, as my previous response.

Will

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Discussion Starter · #5 ·
Will,
Thanks for the instructions. Sure does sound like you have done a few of these switches before. By the way, are you some insider working for Toyota? J/K Anyway, I know of a guy wanting to get rid of a turbo dash that his dad gave him a few years back. It has just been sitting in the garage. I'm going to see if he will let me have it for less than nothing. Again, thanks for the instructions.
 
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