Your 2002 Ranger's tachometer will work just fine with the ALH's tach output signal. The "C3" plug on the back of your speedometer, position 8 which should be BK/Y, if this is ground it's 6 cylinder tachometer operation and open it is 4 cylinder. That signal is 12V square wave.
To get the speedometer running, you need a three wire VSS and something to calibrate that. It's about 140Hz = 100km/h. This signal is also a 12V square wave. I used my Universal VSS ($60 USD) that reads the bolts on my drive shaft and a Hasenwerk VSS Korrekt ($90 USD) to calibrate the signal. The output of the VSS Korrekt is "strong" enough to drive both the VSS-in on the ECU and the Speedometer, however, the ECU will read about 40% high as it wants 100Hz at 100km/h for it's signal. For cruise control use it's not an issue, if you want 100% accuracy for OBD monitoring, a 2nd Signal signal processor would be needed.