Stock Tach. How reliable?

[Gothmog]

How reliable is the stock tach? My is going into the red alot, I know the boost gauge below it differs from the VDOgaige by 5 pounds or more.
Should I be worried?

 

[FlyinGN]

Im sure every car is differenrt but my GN's tach is about 250 rpm high in relation to my autometer tach. Not to bad. Its one light off.

 

[PlaneMech]

Hi,

I would just as soon hang a disco light of the rear view mirror as use the factory tach and boost gauge.

Later,
John

 

[Chris Cornett]

Mine was at least 500RPM off. I have heard some are worse.

 

[SuperSix]

They are completely useless for anything more than entertaining passengers. If you're serious, get real gauges..

 

[John Larkin]

I wouldn't discount or praise either too quickly. I've even noticed a discrepancy between my Autometer and the Scanmaster of approx. 150 rpm at a steady cruise. My stock tach is as close the aftermarket. I suppose it varies car to car.

 

[d0n_3d]

my stock tach is only 200 rpms off what turbolink says...a long time ago my stock boost and tach gauges went out and i have them replaced (the circuit boards i am guessing) so maybe that helped...i have seen some guys cars that read like 3000 rpms at idle!!!

 

[BLACK6PACK]

I've seen several that would redline at anything over idle. Meaning that at 2000 rpm the thing showed 5000 rpm. I've never seen one even close. Mine dash is digital so I don't have to worry about it.

 

[GNVenom]

It is a common problem for the factory tach/boost module to go out of calibration. The calibrated chips need to be replaced and the module needs to be recalibrated at the same time. We do these:
http://www.casperselectronics.com/c...search_request_button=yes&keywords=boost/tach

We exchange your defective unit for a recalibrated unit. It will work properly after the swap. just like the car was when it was new.
-John Spina
www.casperselectronics.com

 

[2 QK 4 U]

Mine was about 1200 r.p.m. off oposed to Scanmaster.

Calibrating the stock gauges would be an excellent choice for those maintaining or restoring a "stock" GN.

in the meantime, don't trust the fact. gauges.

 

[wagon]

The stock tachs are very reliable. About 95 out of 100 are guaranteed to go up when you step on the gas. As far as being accurate. Doubt it. Boost: same thing.

Brian

 

[Gothmog]

Thanls for all the replies!!