[gjmascoli]

Started up the car last night and while still idling the speedo needle blipped and hung up at some random speed. As I started moving, the speedo was worthless, needle mostly lying limp at 0 mph, but random blips and getting hung up at a random speed.

Odometer dead, trip Odometer dead.

Background:
- Sent the speedo to NHS this past winter to get it calibrated because it was reading higher by 5-7 mph
- Speedo has worked fine for the past month, about 300-500 miles driven

I do have electrical gremlins:
- electrical noise in the radio/speakers when I brake
- right front blinker illuminates when I brake
- occasionally the headlights illuminate even when the switch is in the off position
- dome lights sometimes go on when I open door, sometimes not

Does someone have a simple instruction on how to clean all the ground points? Where are all the ground points?
Could this be related to a hodge-podge of bulks from over the years?

Ideas?