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Tach signal w/o ECU

Gimpin

Well-known member
Joined
Jun 9, 2007
Messages
557
Location
Plant City, FL
I am getting ready to set up my Autronic but the SMC model doesnt come with tach out put. Is there anyway I can wire in the tach so that I dont need the factory ECU or an MSD box of sorts?
 

toybreaker

iconoclast
Joined
Apr 30, 2006
Messages
3,581
Dan, I *believe* the tach and ecu share the tach signal.

(As in the ecu doesn't "make" the tach signal.)

This means you may be good to go as is...

Just hook up your new ecu/icemaker/ronco matic engine management system, leave the car harness alone and see what happens.






Caveat Wrencher If you let any magic smoke out trying this, I'm a gonna delete this post and pretend I'm still out on the road, somewhere where there's no intraweb... /ubbthreads/images/graemlins/arriba.gif

/ubbthreads/images/graemlins/grin.gif
 

grocery_getter

Well-known member
Joined
Jun 20, 2004
Messages
1,225
Location
Kent - industrial suburbs of Seattle, WA
If you are using a 91-94 coil pack and transistor package, the tach signal can be sourced from the transistor pin out. There is a pin that is labeled "tach" on it.

If you are using 90 coil pack and transistor package, the tach signal can be sourced out of the little 3 prong 1" by 1" black box attached to the coil pack bracket.
 

Gimpin

Well-known member
Joined
Jun 9, 2007
Messages
557
Location
Plant City, FL
thanks ... great info guys

next question ... do you know if these cars use "smart coils"
 

grocery_getter

Well-known member
Joined
Jun 20, 2004
Messages
1,225
Location
Kent - industrial suburbs of Seattle, WA
No, these aren't smart coils, that's why we have to run a separate transistor/igniter setup on stock coil.
 
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