Tic Toc Tach problem

[R6red4spd69RT]

After 3,000 rpm the needle starts jumping around and gets worse the higher the rpm's get.

Any insights?

[histoy]

Check your dwell on the points, if your car still has them.  My tach started doing the same thing and I found the rubbing block had worn down and the points had closed up, which increased the dwell.

[R6red4spd69RT]

Check your dwell on the points, if your car still has them.  My tach started doing the same thing and I found the rubbing block had worn down and the points had closed up, which increased the dwell.

And there were no other symptoms?

[squeakfinder]

I had a similar problems with an aftermarket (Sun) tach. Apparently an adapter is needed with a compactive discharge box  . But, your car is probably stock.

[R6red4spd69RT]

Yeah, it's stock with points.

[R6red4spd69RT]

Well, I don't have a dwell meter but I did a visual inspection and checked the points gap. They look to be in good shape although the point gaps are both .013 which is outside the .014-.019 specification.

Not sure if this is part of the problem.

[R6red4spd69RT]

So as I was adjusting the point gaps to proper spec's I see what's in the pic.

Might have something to do with what's going on.

[R6red4spd69RT]

I'm glad I found the detached wire which is now attached. Though the tach needle still swings pretty wildly, especially above 3500 rpm.

[histoy]

You asked if there were other symptoms.... yes, the engine started running like crap when the tach needle was bouncing.

[R6red4spd69RT]

My engine runs great and when getting toward 5000 rpm the needle fluctuations stop. So. it seems like between 3000-5000 rpm it bounces around.