Repro Tachs: Questions about them - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brad54 · 01-28-2016, 09:29 PM

Does anybody know if the repro tachs work with modern electronic ignition?
Anybody have one they installed on their truck?

Tazimafied · 01-28-2016, 11:24 PM

They should work with any V8 ignition.

Brad54 · 01-29-2016, 03:44 PM

Quote:

Originally Posted by Tazimafied

They should work with any V8 ignition.

Yes, they SHOULD.
I've been a tech editor for car magazines for 20 years... I know a lot of things that "SHOULD" work, do not.

Hence the question. Wondering if anyone has had any direct experience with installing a repro tach on a truck with HEI, MSD, etc. ignitions, and had it work.
The sine wave of electronic ignition versus points ignition is different, and original tachs often can't read the waves generated from electronic ignition.

A lot of reproduction tachs can't either.

(I've got a friend who converts them to run with electronic ignition... he did an original Sun 8.5-grand tach for me that's going in my nostalgia Altered race car)

-Brad

**The Rocknrod** · 01-29-2016, 04:52 PM

You "may" have to use a tach filter: http://www.classicparts.com/1947-72-...ctinfo/24-736/

jb9281 · 01-29-2016, 04:59 PM

I installed the Repo tach from The Car and Truck Shop. It works great. I have a 350 with an HEI distributor. You can install it without removing gauge cluster from truck.

**The Rocknrod** · 01-29-2016, 05:06 PM

Well there you go.
I have that one in my gauge cluster now. Good to know jb9281, thanks.

01-28-2016, 09:29 PM	#1
Brad54 Registered User Join Date: Aug 2006 Location: Athens, Georgia Posts: 1,457	Repro Tachs: Questions about them Does anybody know if the repro tachs work with modern electronic ignition? Anybody have one they installed on their truck? __________________ '61 Suburban daily driver: off the road due to 180-pound 8-pt buck! '62 K-10 long-step project '61 C30 Camper, aka "Valdez" There's no cool like Old School

01-28-2016, 11:24 PM	#2
Tazimafied Registered User Join Date: Feb 2015 Location: Ridgecrest, CA Posts: 94	Re: Repro Tachs: Questions about them They should work with any V8 ignition.

01-29-2016, 04:52 PM	#4
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Repro Tachs: Questions about them You "may" have to use a tach filter: http://www.classicparts.com/1947-72-...ctinfo/24-736/ __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

01-29-2016, 04:59 PM	#5
jb9281 Registered User Join Date: Nov 2012 Location: fremont. nc Posts: 272	Re: Repro Tachs: Questions about them I installed the Repo tach from The Car and Truck Shop. It works great. I have a 350 with an HEI distributor. You can install it without removing gauge cluster from truck.

01-29-2016, 05:06 PM	#6
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Repro Tachs: Questions about them Well there you go. I have that one in my gauge cluster now. Good to know jb9281, thanks. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?



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