Tech Questions/Advice
23174 124 SP 9000 rpm tach troubles>>>>> [myronx19] (Thu Sep  9 19:03:03 1999)
   23184 Re: 124 SP 9000 rpm tach troubles>>>>> [bartigue] (Thu Sep  9 19:42:26 1999)

Hi all,

I have a 124 Sport Coupe tach in my X1/9 race car.  It reads up 
to 9000 rpm.  Problem is, when the car is idling at 1000 rpm, 
the tach doesn't register that.  (I am using a Crane HI-6R box 
and Crane PS-92 coil, the box has a tach trigger wire, but it 
doesn't need a tach adapter)

2nd, the sweep action is quite slow? (are they all that way?), 
and once I let off the loud pedal, the tach decends, then 
bounces up 1000 rpm, then falls again.  Ahhh.  That sucks, I 
cannot trigger this right off the neg of the coil, my box cannot 
work this way.

Is there any way to at least adjust the tach, so it reads 
correctly.  This is a real pain, I am relying on the rev limiter 
to tell me where the redline is!

Cheers

You can do it, but you'll have an easier time just getting a new 
tach.  

To do it, open the tach (by removing the front face and 
unscrewing the back, revealing the guts).  You'll see an 
adjustable pot (there's only one). 

1980 Fiat Spider (Huge Weber 36ADL)
1971 Fiat 850 Sport Spider (Body for sale)
http://www.peoplesoft.com/peoplepages/a/bradley_artigue

dauber