Andy
You probably know the requirements of PHD2, but a laptop with just 4GB of ram and a basic processor would do the job ( even a good second hand one )
Plus a 50mm guide scope like an Orion ( replaces the finder scope ) and a ZWO ASI120MM-3 guide camera
A few USB cables
PHD2 free down load
A hour or two of nutting it out
A few good nights for focus, trial and error plus collecting darks
And your up and guiding
Cheers
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