Earlier this month, I swapped in an SR5 gauge cluster for my 1987 4Runner DLX (22RE, manual, 4wd). I performed this same swap years ago on my '94 pickup without issue. Researching the swap for my 4Runner showed that it was the same ordeal, with the consensus across several different forums and threads across many years being that the dash cluster wiring is all the same (with the exception of some vehicles not having a tach wire), making it a plug & play swap after replacing the oil pressure switch with the necessary oil pressure sending unit. For clarity, I'm only talking about manual SR5 clusters being swapped into manual 1st gen 4Runners ('83-'89) and '84-'88 Pickups.

I purchased cluster #1 on eBay, which the seller listed as being from a 1986 Pickup 22RE 4x4, but when the cluster arrived, it had grease pen writing on the bottom (area not pictured in ebay listing) saying 1989 V6 4Runner. Removing the lens to see the edge of the tach face revealed the printed "6 CYL" confirmation. I installed it anyway just to see if it'd be worth going to the trouble to adjust the tach. Everything worked except for the oil pressure and voltage meters, so I returned it.

Bought cluster #2 from the same seller on eBay, also listed as coming from a 1986 Pickup 22RE 4x4 (doubt this was true as there was also a 3rd manual cluster they were selling with the same details). Checked the tach face and this one does not show it to be from a 6 cylinder vehicle. Installed the cluster and it had the same 2 gauges not working, along with the tach, temp gauge, and fuel gauge not working either. The back door light on the cluster was pulsing when the engine was running, even with the back door/glass fully closed. I figured something was up so I did some digging.

Comparing pics of the #1 to #2, I noticed the film traces on the back were different. The tachometer signal trace on each cluster went to different pins on the dash harness connector. At that point, knowing there was at least that 1 difference, I combed through the whole circuit trace, listing each pin and what they went to, then compared that list with what the factory service manual showed the pinout to be for my 1987 4Runner.

Altogether, there were 6 mismatches, with one of them being that the oil pressure gauge signal wire of the dash harness was being mismatched to the back door light on the cluster, hence why that light was pulsing. I mapped out the moves that needed to be made to depin, relocate, and repin each wire to where SR5 cluster #2 needed them to be, then made labels for each of those wires so that I could easily undo this if need be.

Was__Is
A3 --> A2
A4 --> A3
A5 --> A4
A6 --> A5
C4 --> C5
C5 --> C6

Put the cluster back in the 4Runner and it all works, but noticed the voltmeter reading low despite my multimeter showing the alternator to be A-OK. Took the cluster apart and did some measurements and on every stud/nut inside that several of the gauges use, they all had high resistance readings (6k+ ohms) across each stud/nut. I removed each nut (all of which seemed a bit loose), cleaned the contacting surfaces, then reassembled. The multimeter now showed little to no resistance (~1.4 ohms), and this helped get a lot more movement out of each needle, including an A-OK indication from the voltmeter.

During that contact cleaning, I noticed dates printed on most of the boards inside, showing: '86, 8, 22
I doubt a gauge board manufactured in late August 1986 made its way into a 1986 model year Toyota. More than likely, this cluster came from a 1987. However, I have no idea what the factor is that makes this one seemingly an oddball compared to what the majority majority of manual SR5 clusters are, given that this one requires repinning wires whereas the vast majority of manual SR5 clusters for this generation do not since I've yet to see any other mention out there of people needing to repin to get their manual SR5 cluster to function in their manual 1st gen 4Runner / '84-'88 Pickup.

I didn't come across any info out there regarding the different cluster circuit film traces or the identifiers that Toyota or Yazaki Meter used to identify and distinguish them, but I imagine the 9 digit part numbers and/or the 1 digit "boxed" numbers (both printed on the film) and/or the 3 digit stamped numbers (ink stamped on top of the box number) are keyed to different configurations.

For whatever it's worth, here's the ones I've seen:
769804-203 6 in box w/ 721 stamped over SR5 cluster #1 that I bought. Manual, V6, tach worked, but non-working oil pressure gauge and voltmeter. No repinning required. Returned for refund.
769804-240 7 in box w/ 722 stamped over SR5 cluster #2 that I bought. Manual, 22RE. Required repinning 6 wires to get tach, oil pressure gauge, fuel gauge, temp gauge, back door light, and check engine light working.
769804-252 8 in box w/ 723 stamped over SR5 cluster seen on eBay. Automatic, V6. Listing title says "88-89".

Super long to explain, but hopefully this will help guide someone to a solution if they find similar symptoms on an SR5 cluster they swap in, as I can imagine some have wound up with one of these types of SR5 clusters, had similar issues when installing, then just assumed the cluster they got must have already crapped out since the internet says they're supposed to be plug & play.









Before cleaning stud/nut contacts.

After cleaning stud/nut contacts. Nut snugged down a bit tighter than how it came from the factory.