Instealling late mod MM "Sport" gauges in 87 D50?

[FMS88]

The harness connections to the carburetor and FI models are different. The 87-89 clusters have three connectors, the 90-91 have only two. If the 91 configuration applies to subsequent years, some rewiring of the '87 will be needed. You definitely want a cluster out of a 4x4 if you want those lights to work. Here's the cluster schematic for '88 and '91 model years:

Correction: The statement and schematic that the FI versions have only two connectors are incorrect. There are three three connectors to 90+ years, each with the same number of potential wires appearing in the '88 schematic. The '91 schematic is wrong. For the correct schematic see my post of 02-01-2019 below.

[mikec96]

BTW... FMS where did you pull those wiring diagrams from? I use alldata when I pull up any year MM or D50 from 87 to 95 the diagrams all show the same 3 connectors for the dash...

[FMS88]

BTW... FMS where did you pull those wiring diagrams from? I use alldata when I pull up any year MM or D50 from 87 to 95 the diagrams all show the same 3 connectors for the dash...

You are correct. There are three connectors for the 90+ cluster. Both diagrams in the earlier post are from Chrysler shop manuals and the '91 schematic omits the third connector (#B05). The Alldata diagram is correct, and LSR Mike added the correct diagram to his thread in the manuals section. See: http://mmeierle.com/MeterCircuit-1.jpeg

The number of possible wires in the three connectors are same for the two years. So the 87's connectors will plug into 90+ clusters. The only question is are the 87 wire positions the same in the 90+ years? That I can't answer since I don't have such a cluster.

Thanks for questioning the diagram. I'll edit and correct the post above.

[mikec96]

Well I can tell you with certainty that they are interchangeable with minimal modification. I am currently running the 95 Sport gauges in my 87. The only things that aren't working currently are the brake light (which I dont think was working right before the conversion), the charging light (which never worked after the FI 4g64 swap) and the Tachometer. As mentioned above I have only had to move one wire on the 10 pin connector for the oil pressure gauge and cut out the hole/clean the contacts for the added 4WD light. I did forget to mention that I added a wire from the gauge (reed switch) to the ECU for speed input. I am not sure if the ECU really needs that input to function correctly but it is a California ECU so probably.