1992 Volvo 740 auto sedan. Help ! My speedometer has gone krazee. Needle bounces up & down erratically. Hope it isn't speedo itself. Maybe it is bad wire. Does wiring to speedo come from tranny or from rear differential. I see wires coming out of both tranny and rear differential. Wire from tranny goes to a connection by firewall in engine compartment. Lord knows where differential wiring goes to. Thanks for help with this herky jerky speedo.
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' 91 740 sedan nearly 157,000 and ' 87 240DL auto nearly 135,000
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