[68 ReNay]

Thanks for the replies guys! and sorry i'm so long in responding. i forgot to check the box to get notified when someone responded. then i just got swamped and side tracked.

the speedo cable and housing are new. that was the first fix i tried, to correct the bouncing needle. but i also pulled that new cable out and graphite oiled the crap out of it - no change. i bought the new speedometer as a 'last resort' - no change.

mrein3, i never did like math and i don't really know what the significance of being off by a constant 10% means (in order to fix the problem) in your post.

Keith, i hadn't heard of a speedo adapter before. i'll have to check into that.

Thanks 67Slider. that's about the only thing i haven't checked. i pulled out the drive gear at the end of the cable and it looked good to me.

Thanks again for everyone's input. i'll let ya know what i find out - when i find the time to look at it!