Tach with HEI Distributor

[nivensid]

Installing the HEI in my 86 CJ7 AMC 258 i6 / 4.2l engine. My question is will the factory tach work with the HEI? I have read conflicting answers. Will i need to replace the factory tach and get one that is compatable with HEI ignition?

 

[Posi]

My factory tech is wired to the tach side of the HEI and it works as it should.