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1.28 with the meter set at 20k means 1.28k ohms which should be fine. 0.002k (2 ohms) at the speedo connection is not ok though - this indicates a shorted speedo input filter stage. Could be a simple (cheap) repair at the right place (old fashioned radio/TV shop or similar) but I guess this is the time to go for a new or used one. Inspect the printed circuits at the back of the instrument cluster carefully for shorted leads before ordering/replacing. Any speedo out of a 1991-94 940, 960 or 740 (with 900 dashboard design) should work.
Martin
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'65 121, '73 165
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