Tachometer and Transmission Issues

[Pestka, Dennis J]

I have 2 issues with my 65 Datsun Pickup that I hope someone can help
with.
First is with my tachometer.
Purchased the 3" electric tach, sensor, and magnetic collar from
EVparts.
When I step on the accelerator, it immediately buries the tach at the
maximum 7000 rpm.
As I continue to accelerate, it stays at 7000 rpm.
If I let off the accelerator, it drops back to what seems to be a more
correct reading; 2000 - 2500 rpm.
Press on the accelerator again, and it buries at 7000 rpm.
I adjusted the sensor spacing out and in from the magnetic collar, and
it seemed to make no difference.

Second is with my transmission, or adaptor, or ?
First and reverse gears are very noisy when accelerating. Kind of a
grating, rubbing sound.
2nd, 3rd, 4th are very smooth and quiet.
Could this be normal for these gears, or some other problem.
Also seem to get a grating sound when slowing down to a stop in any
gear.
Don't know if this is the same issue, or if it could be the brakes, or ?


Can any of the old Datsun people shed any light on this.
Any suggestions would be greatly appreciated.

Dennis
Elsberry, MO
http://www.evalbum.com/1366 






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[Mark Farver-3]

On Wed, Jul 1, 2009 at 5:55 AM, Pestka, Dennis
J<Dennis.Pestka@...> wrote:
> First is with my tachometer.
> Purchased the 3" electric tach, sensor, and magnetic collar from
> EVparts.
> When I step on the accelerator, it immediately buries the tach at the
> maximum 7000 rpm.

Your problem is likely that the tach is picking up noise from the
controller's PWM.

You probably need to use a shielded cable from the sensor to the tach
module itself.  In my case I used a piece of headphone cable (two
conductors surrounded by a shield) with the shield ground to the
chassis on only one end.

Mark Farver

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