Hi Folks,
My engine is a KillerB installation - 2006 3500 LX9 122730 ECM OBD1. The tach wire comes from the ICM under the coil pack. The wire shows 3 volts at idle and 8-9 volts when revved. I have installed a new VDO Electric Tach p/n 333-160. Its not working. I've talked with the VDO tech guys and they are trying to figure it out.
I installed a Sunpro Tach Signal Booster CP7561 To boost the signal - no help.
What are you guys that have ECM's using for a tach?
Thanks,
Tim
timringland@hotmail.com
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Tim, I'm using a stock tach with an updated circuit board in it. I've found it to be very close to what the ECM thinks the engine is turning throughout the rpm range.
-- Scott
Thanks Scott,
Where did you get the updated circuit board for the stock tach?
Tim,
I got it from here:
http://members.shaw.ca/tsmit/tachmod/tachmod0.
I've had it for over 10 yrs now so it was cheaper when I got it. I think we're running similar ECMs and ignition systems. I would think your VDO tach would work with DIS.
-- Scott
Hi Tim,
Are you using the white tach. wire from terminal "E" on the ICM?
You might have to program your tach for alternator sensing as I think the ICM output is in 1 pulse per rev.
Just turn switch # 1 off and see if you get a response.
Hi Fred,
Yes I am using the whte wire from the ICM. On my ICM the white wire is coming from terminal C. Terminal E has purple/white - reference high to the ECM, Terminal F black/red reference low to ECM.
On the tach - with dip switch #1 in the off position - what position are the other two in?
Thanks, Tim