Getting stock tach to work after LS1 swap

[malibu80]

Hopefully someone here has a solution. I've got a 79 Malibu that has a LS1 T56 swap and I can't figure out how to get the stock tach to work with the LS1 ECM.

 

[85GPLef41]

i thought i read somewhere that you can switch the tach settings in the computer and then wire it in... Could be wrong cuz i also read you could use a buffer box, digital tach etc etc.. I interested in this as well as i would love to keep the factory tach i found... I found this for the factory speedo but it's big $$ :shock: http://speedscenewiring.com/ssw_zen/ind ... ucts_id=12
also seen this for the tach....
http://speedscenewiring.com/ssw_zen/ind ... cts_id=136