E-body rallye tach repair

Hi,

Has anyone repaired the 1970 rallye tach that came in the E-body, and could you perhaps say what component failed or was replaced?

Thanks

There are a couple of large wattage resistors that fail after one of the transistors shorts out. I have never found a schematic for the board. I just replaced the innards with the RT Engineering board. Greg the designer says it is much more accurate and I have to agree. I have a Megasquirt board running on my car and its digital tach indicator is very close to the indication on my in dash factory tach with the new board.
Here is a write up on the install:
http://rt-eng.com/rte/images/8/8e/RealTimeEngTach_MoparActionApril20005.pdf

Craig

Thanks Craig, I will give RT a call, and go through my OE PCB when I have time.

If you want someone else to mess with it, Shannon at www.redlinegaugeworks.com is local just in Santa Clarita.

+1 For Redline Gauge works.