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Tach wiring with MSD?
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neejah View Drop Down
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    Posted: 28-December-2009 at 11:47AM
I just wondered if anyone had managed to connect their standard Sports pack instruments to an MSD system.

Basically, I've started wiring as per - http://www.ranchero.us/forums/showthread.php?t=8411 , running the tach in series........so from the ign switch it runs through the tach then to the + side of the coil.
But, the MSD system takes a signal from the ign switch to power the box..........and an external supply to send a signal to the coil. So if I connect the wire from the tach to the MSD I'd expect I'll see nothing on the tach.

If I run the output from the MSD to the coil through the Tach - would that work? (MSD state nothing other than the MSD to be connected to the coil).....so I suspect not......

The MSD does have an output for a tach, but it's a single wire and I would suspect designed to work with a parallel type tach?

Just wondered if anyone had done it?

Thanks

Neil
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lynchster View Drop Down
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Points: 2150 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lynchster Quote  Post ReplyReply Direct Link To This Post Posted: 28-December-2009 at 12:53PM
Nope. But feel free to fill me in when you figure it out. I may go that route with the Ranchero.
 
Chuck  


Edited by lynchster - 28-December-2009 at 12:53PM
Chuck
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Psquare75 View Drop Down
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parallel, as in, the tach has + - and 'tach' signal?
Paul
77 XR7 460/C6/3.00:1 *SOLD*
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Points: 114 		Post Options Post Options   Thanks (0) Thanks(0)   Quote neejah Quote  Post ReplyReply Direct Link To This Post Posted: 29-December-2009 at 3:28AM
Originally posted by Psquare75 Psquare75 wrote:

parallel, as in, the tach has + - and 'tach' signal?

Yes, I'd assume so - i.e the tach is powered externally......and the tach receives its signal from the MSD box...
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Points: 4591 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 29-December-2009 at 3:32AM
Well, I believe the older Torino indash tachs go 'in series' in line. The later cars (My Cougar), have a parrallel setup like I described.. I have my factory tach running off the MSD box.
Paul
77 XR7 460/C6/3.00:1 *SOLD*
78 XR7 523/C6/3.5:1
79 F100 460/TKO500/3.25:1
'I also have some left over potatoes-I understand you can generate electricity from them'- Foote500
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Points: 920 		Post Options Post Options   Thanks (0) Thanks(0)   Quote GranTorinoMan Quote  Post ReplyReply Direct Link To This Post Posted: 29-December-2009 at 6:47AM
I tried to run the factory tach and my Haltech EFI off the same HEI designated tach wire and my EFI wouldn't run. The factory tach takes a lot more juice than the aftermarket ones. My EFI fired right up after I disconnected the factory tach and hooked up an Auto Gauge tach instead.  
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neejah View Drop Down
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Points: 114 		Post Options Post Options   Thanks (0) Thanks(0)   Quote neejah Quote  Post ReplyReply Direct Link To This Post Posted: 01-January-2010 at 9:08AM
Thanks to all that contributed - and a happy new year! Got it sorted - I think!

Originally posted by lynchster lynchster wrote:

Nope. But feel free to fill me in when you figure it out. I may go that route with the Ranchero.
 
Chuck  

You need an MSD Tach Adapter 8920........basically it's for a current sensing tach, the MSD website had all of the data sheets for their adapters........just need to finish off the rest of my dash re-wiring.
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