86 4000q speedo problems

[Evan Manaresi]

A lot of times my speedometer needle sticks at the pin, so that when I
start driving, it stays at zero, but if I tap on the cluster, it starts
working, I imagine it just needs some lubrication, but don't know what
to lube or even what lube to use, it is no problem taking it apart, but
where can/should I lubricate it, anyone ever have this problem before?
BTW, I am 99% sure it is not the cable that is the problem.