i swapped out my tbi motor for a carb'd on my 91 rs and need information on how to hook up my tach. im not too familar with distributor and stiff but i do no that my new dist. is not computer controlled. its an msd with a 6a box and coil. on my dist. theres a plug that connects it to the 6a box. and from 6a box theres 2 wires that go to the coil (pos/neg) and also a wire that goes from dist. cap to coil. does any one have information on how i can hook up my stock tach to this set up? ive included some picks to help explain it a little better.

 

I believe it is a white (might wait for someone to confirm) wire that ran to the negative side of the OE coil, you want to hook it to the negative side of your aftermarket coil. Thats the route i went.

 

Don't put it to the coil. If you do that with an MSD you'll fry the tach. Connect it to the tach terminal on the box.

 

alrihgt cool thanks for the tip. im gonna try that out this weekend, thank for the help man
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what do u mean by tach terminal?

 

i believe msd boxes have an extra wire or spot for the tach, im not a fan, i dont worry about them

sorry about the bad advice on the box

 

alright i just wnet and checked my msd box and it does have a tach hookup that i never noticed before. so would i hook up the white wire to the tach input?

 

Right, whichever color wire it was that connected to the tach terminal on your original distributor.

 

well thanks for all the info. ill be wiring it up this weekend some time

 

The MSD 6 installation instructions have pretty much every wiring diagram you could ever need.

 

yea i lost my instructions a longg time ago haha. but i have it pretty much figured out
but i do have another issue: my speedo. i removed my ecm so is there a way to hook it up again??

 

http://msdignition.com/1download.htm

As long as your wiring isn't butchered, you don't need to reconnect the speedo.

 

alright man thanks for all the help ill let ya know how it turns out

 

you might need to remove the tach filter i know i had to on my 84

 

tachfilter?? where would i find that

 

Follow the tach wire back to the firewall. You might not even have a tach filter.

 

if i remember right it is a little black or is it silver cylinder on the fire wall it should be in series with the tack i believe.

 

i cant recall seeing anything like that so im goin to hook the white wire tot he "tach terminal" port on the ignition box and see what happens