Finally the speedometer of this 1989 Volvo started to acting-up. I was cruising at a speed of 80km/h while recording this erractic needle jumps. Will update you guys once solved.
My initial thought to check;
1) The speed sensor socket at rear axle have come loose/wires cracked and touching each other. Yesterday I have a look at them and they looks fine with thick road grimes coverings. Will use multimeter to measure at the instrument board socket, if the multimeter jumps here and there as well, most probably will be wiring issues; if not
2) The instrument board/circuit issue. Have to investigate further.
Wish me luck!
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