Hei distributor swap

[jeffloya@gmail.com]

I have a 85 bronco with a 351, 5.8l. I want to swap to a GM hei distributor. There is a red and green wire on the old coil. Once I spliced on to new pigtail for the hei, the tach pegged all the way over. Does any buddy know how to correct this so I can use my stock tach ?

[jeffloya@gmail.com]

Is my post being seen. I have got no replies?

[Becks_Bronco]

I’ve been watching but I don’t have any answers. Also curious.

[Austen2019]

Your missing the ground wire to the hei believe black with green there will be two ground wires for the hei to make the tach work. I have more details if you can’t find it text me 7146141097

[SteveG]

The distributor cap should have markings telling you how to connect. You need two grounds internally, and external ground, positive power (with key on) and coil (-).

I don't have any images on me now but can circle back. Post photos and I'll help.