The cheapest option for speedometer cable hook up would be to get the tail shaft housing from a 1995-1997 4R44E or 4R55E automatic, doesn't matter what engine it has
Your 2006 5R44E tail shaft MIGHT STILL HAVE the speedometer drive gear, just no way to access it, the speedo drive gear was machined on to the tail shaft, not sure if Ford ever stopped making them that way
So pull off the tail shaft housing and have a look
If its there you can put on the older tail shaft housing that has the hole to put in the speedo Driven gear
There are a few options to convert electrical pulses(OSS sensor signals) to mechanical drive speedo cable
2001-2011 Rangers have the computer converting the OSS sensors signal, 32,000ppm, to the Ford Standard 8,000ppm(pulses per mile)
So the computer has a "speedo" OUT pin, which went to cluster and Cruise module, pin 68, grey/black wire
You can use that with an electric motor to drive a speedometer cable, its not cheap
There are also GPS to mechanical drives, they work but not vary accurate when driving on curving roads or up and down hills, GPS assumes flat and straight roads, lol
Other option is to turn the mechanical speedo into an electric model, Ford model that uses the 8,000ppm signal
2006 2.3l still has a TEMP SENDER, it was behind the head on a metal coolant hose, that should work for the 1961 dash temp gauge
Red/white wire to cluster, black/white wire is ground
Not familiar with Rambler tech and what OHMs the temp gauge expects, but worst case is you would swap current one with Rambler model
Rambler just had an Oil Light, 2.3l just has an oil pressure switch, so that should work out, lol
Ranger oil pressure switch is normally OPEN, you will want to change that switch to a normally CLOSED oil pressure switch to use it with a light bulb
OIL Light bulb gets 12volts with key on, and its GROUNDED by the normally CLOSED oil switch, OIL light bulb is on
When you start the engine oil pressure pushes OPEN the switch, light bulb off
Rambler has a GEN(generator) light and that should work out as well with simple rewire
2006 2.3l alternator will have a yellow/white wire and a light green/red wire on a 2 wire plug in
The green/red wire was connected to the Battery Light in the 2006 cluster
The Battery light in the cluster got 12volts with key on
That 12v runs thru the bulb and to the alternator on the green/red wire, since the alternator is not working its in essence "a ground", so Battery Light is ON
When engine is running and alternator is working then Battery light has 12volts on BOTH wires so its OFF, actually 14volts with engine running but same thing, lol
Battery light on again means alternator is a ground again, so not charging the battery
Fuel gauge will work as is, assuming its working, lol