I'm going to bet that any gauge swap on a CUCV is going to be wire intense since we are talking about a complete retrofit from 80's technology.
Speedo signal is no issue. You can use a $25 hall effects pickup on the tcase just like stock 90's factory stuff.
Tach signal of it is a diesel tach will come from the alternator w feed which essentially is single phase AC voltage. Now this will have to be calibrated since the tach doesn't know how fast the alternator is spinning in relation to the crank. I used a free app on my phone. Drive down the road and take a reading, recalibrate. After about 4 tries it is spot on.
Temp and oil are going to need senders that match the gauges. Simply reuse the factory wires with the new senders.
I will say I like to look of the NVU Aviators. They do require a ton of fitting since they mount to a board that bolts to the sheet metal. I'm guessing any gauged retrofit that goes this way suffers from the same trouble compared to one that mounts to the back of the bezel.
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