MSD 6AL and stock tacho
#1
Posted 10 February 2017 - 01:02 PM
Has anyone split the Tach Output wire from the 6AL to run a tacho and trigger an EFI system?
I note MSD appear to state in this thread it can support 3 devices.
Post #4
https://forums.msdpe...erratic-reading
#2
Posted 10 February 2017 - 01:25 PM
There is no point in connecting this output to an EFI system as its timing-dependent, i.e. it already reflects any advance and does not provide an accurate reference. The best gains from EFI are made by controlling the timing anyway.
You can still keep the MSD unit with a number of GM and other style ECU controlled ignition modules, it just goes between the output of the other module and the coil.
#3
Posted 10 February 2017 - 01:28 PM
This is what I am referring to. W/O timing control, it is required to be connected to the Tach Output of the CDI box.
Attached Files
#4
Posted 10 February 2017 - 01:45 PM
Looks like it is set up to use the green and violet wires direct to a magnetic pickup dizzy (which would then be locked) and control ignition timing? Without that its really just an electronic carb.
#5
Posted 10 February 2017 - 02:14 PM
This is with timing control
Attached Files
#6 _SRH11_
Posted 10 February 2017 - 10:18 PM
Hi, I'm running a FiTech 600 hp Power adder and MSD 6A on a 308 in a UC hatch.
I made up a small electrical wire "Y" piece to split the signal coming out of the MSD box. One goes to the FiTech unit (I'm running w/o timing control) and the other to an aftermarket tacho (with shift light) and all works well.
I even tested it on the original UC tacho and it works (except it is a 6cyl tacho so the reading is out).
I have been running this combo for about 9 months and have had no issues with it.
Hope this helps.
#7
Posted 10 February 2017 - 10:39 PM
#8
Posted 11 February 2017 - 05:19 AM
#9
Posted 11 February 2017 - 09:03 AM
What engine are you going to control with this system. Chev, Holden.
#10
Posted 11 February 2017 - 09:17 AM
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