Positive ground tach
 

I have a really dumb question but are going to ask it anyway.

Recently had a Sun D-1 tach converted by Williamson to not require the sending unit. My Model A is the first positive ground car I've owned and don't know where to connect the "trigger" wire for the tach.

I don't want to risk screwing the tach up, can someone please advise me where to connect the trigger wire from the tach.

I appreciate everyone's patience with my questions. You're all really a big help.

Re: Positive ground tach
 

see attached.

https://www.santaanitaas.org/wp-cont...Tachometer.pdf

Tom Endy

Re: Positive ground tach
 

So a tach or tach-dwell meter attaches and works regardless of whether the ignition is positive or negative ground?

Re: Positive ground tach
 

Whomever converted it for you, perhaps you should send them an e-mail, and ask them? A photo of which wires might help. I hate finger pointing contests, if ya know what I mean.

Re: Positive ground tach
 

The trigger wire should attach to the points side of the coil.

Re: Positive ground tach
 

I hooked up my old Sears engine analyzer from the "70's to my model A truck and it worked just fine. Tach and dwell. I think I just reversed the leads so that the black clip went to the coil and red to ground.. It's analog so I wasn't afraid of damaging it.

Re: Positive ground tach
 

God bless analog. :)