inop tachometer/need new tach?

[Joshua van Tol]

Probably a bad ground somewhere. You're probably making a weak ground  
through the brake light when you yank the hand brake.

On Dec 16, 2005, at 8:51 PM, AUDIJIM at aol.com wrote:

> I made some great observations yesterday. After I re-soldered every  
> contact
> on the instrument cluster (IC) boards, the Tach was again inop. But  
> it was
> actually working correctly for two or three days until yesterday.  
> Why? I don't
> know. I found that if I pull the hand brake (emergency brake) and  
> the "Brake"
> light indication illuminates on the cluster, the Tach works. If I  
> release the
> hand brake, the Tach stops working. I usually do not use my hand  
> brake, but I did
> this time. All I have to do is trip the hand brake switch, the  
> light comes
> on, and the Tach starts working. Today after work, I got in my car,  
> took it out
> of gear, started it in neutral and my foot on the brake and the low  
> oil
> pressure graphic came on and the Tach stopped working. As soon as I  
> pulled the hand
> brake, the low oil graphic went away and the Tach came back to  
> life. So I'm
> getting somewhere! So I have a hard case for my sunglasses that  
> when positioned
> under the hand brake lever, it just lifts the lever up enough to  
> trip the
> switch and the brake warning light comes on, but not enough to drag  
> the parking
> brake on the rear calipers. I'll play with this in the wiring  
> diagram tomorrow.
>
> Jim
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