The wiring under the radio is not a big deal. They left the original wiring to the plug. Which will give you a good start on removing them. Unplug and remove the wires to the radio itself.
Now you have two fuse boxes the on you showed and then there is on under the hood(black box) by the battery.
A test light will get you through most of the wiring $5to6. That will help you to find hot leads.
As for your speedo ant working there is a plug or connector that could have buildup on it remove a few screws to allow it to drop toward you to check it. Sometimes you can wiggle the connector or unplug it and plug it back in then it works. do the easy steps first like checking all the fuses in both places. use the same size if you replace any.
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Originally Posted by bigsquat
im just cheap, and cheap makes you creative.