Re: [Amc-list] Re; Tachometer and fuel injection hook ups.

[Wrambler242@xxxxxxxxxxx]

My Autometer Sport-Comp in dash tach has needle flutter below 1500 rpm with the ecu tach feed and set to 4 cyl. 
  Changing the signal source to the neg coil feed and setting to 6cyl almost completely eleminated all flutter. 
   Now this could be a problem with my tach.
The needle flutter is a noted possibility with using the tach signal hookup on the Kit John used. They say to switch to the neg coil lead if it occurs. At some point I plan on asking Autometer if they have something to smooth this out. It is very minor now. It was not really unusable even with the 4cyl setting and th eflutter. It wiggled perhaps 3 needle widths.
  I assume this is due ot the air core and loose action of the tach to keep it accuarte.
The Jeep ecu signal is a 2 pulse [4cyl] 5V signal.

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5

 -------------- Original message ----------------------
From: "John Elle" <johnelle@xxxxxxxxx>
>  
> Snip
> the EFI system works the same on Renix and HO, some of the signals
> changed when the switch was made to the Chrysler/Phillips HO system.
> Snip
>  
> I have the latter system (94/95 compatible) and an aftermarket
> tachometer hooked up to 
> it with no problems. You just had to set the tachometer for a 4 cylinder
> application as the 
> counting pulses were 4 cylinder compatible. The AMC current sensing
> tachometers stayed 
> in use with I-6 cars up through the Hornet I believe. However the
> counting tachometers 
> were used in 1971 for the V8's I think. 
>  
> John. 
>  
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