tachometer problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dakotatech · 12-26-2002, 08:09 PM

anybody have AC and DC voltage reading from the negative side of the coil, and/or tach output from the computer on a 1998 Chevrolet 454. Trying to get tach to read properly in a 1999 Chevy. Cannot take readings myself, as am trying to help from a distance. The readings I have gotten don't quite make sense and would just like some more info for back-up.

dakotatech · 12-27-2002, 03:55 PM

the tach signal works, but is reading double, the '99 computer was outputting a 4cyl tach signal, the voltage readings i have been given don't seem correct for a signal coming from the negative side of the coil. I can change the 8cyl reading to the 4cyl necessary, but am running into problems reading the signal from the 1998 454.

Any assistance would be greatly appreciated.

12-26-2002, 08:09 PM	#1
dakotatech Registered User Join Date: Dec 2002 Location: South Dakota Posts: 2	tachometer problems anybody have AC and DC voltage reading from the negative side of the coil, and/or tach output from the computer on a 1998 Chevrolet 454. Trying to get tach to read properly in a 1999 Chevy. Cannot take readings myself, as am trying to help from a distance. The readings I have gotten don't quite make sense and would just like some more info for back-up.

12-27-2002, 03:55 PM	#2
dakotatech Registered User Join Date: Dec 2002 Location: South Dakota Posts: 2	more information the tach signal works, but is reading double, the '99 computer was outputting a 4cyl tach signal, the voltage readings i have been given don't seem correct for a signal coming from the negative side of the coil. I can change the 8cyl reading to the 4cyl necessary, but am running into problems reading the signal from the 1998 454. Any assistance would be greatly appreciated.



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