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1970 tach issue #2752303
03/15/20 06:42 PM
03/15/20 06:42 PM
Joined: Oct 2004
Posts: 702
Oklahoma
G
gregok Offline OP
super stock
gregok  Offline OP
super stock
G

Joined: Oct 2004
Posts: 702
Oklahoma
Okay, here’s the problem. I have a rally tach in my 70 cuda. A MSD ready to run distributor is in the 440. The tach doesn’t register correctly and it has been rebuild during restoration in 2019. We have been on the phone constantly with MSD tech support but nothing we tried worked. We tried with a tach assist module with no luck. We tired it with an MSD ignition box but to no avail. We tried as many stabs as we could but the tach may read about two hundred rpms on startup but then drop to zero. I was curious if anyone else had a similar issue with this setup and what did you do to correct or resolve the problem? Any thought would be appreciated. I was going to try as many avenues as possible before removing the tach and having it examined. Thanks in advance.

Re: 1970 tach issue [Re: gregok] #2752551
03/16/20 01:19 PM
03/16/20 01:19 PM
Joined: Nov 2007
Posts: 21,275
Kirkland, Washington
Pacnorthcuda Offline
Too Many Posts
Pacnorthcuda  Offline
Too Many Posts

Joined: Nov 2007
Posts: 21,275
Kirkland, Washington
I rebuilt my tach with the modern electronics about 14 years ago. 70Cuda. I also have an MSD 6al AND the tach module. It works.......but.....

If you are familiar with the normal operation of these vintage tachs, great. If not, be aware their response is SLUGGISH, and they are imprecise.

After all I did, I ended up mounting an Autometer tach right in front of the original.

Re: 1970 tach issue [Re: gregok] #2752846
03/17/20 01:20 PM
03/17/20 01:20 PM
Joined: Jun 2004
Posts: 375
7
71ragtop Offline
enthusiast
71ragtop  Offline
enthusiast
7

Joined: Jun 2004
Posts: 375
Where can I get a tach rebuild kit for my ebody tach.

Re: 1970 tach issue [Re: 71ragtop] #2752875
03/17/20 02:57 PM
03/17/20 02:57 PM
Joined: Jan 2003
Posts: 17,311
UPPER MICHIGAN, MARQUETTE COUN...
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NITROUSN Offline
I Live Here
NITROUSN  Offline
I Live Here
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Joined: Jan 2003
Posts: 17,311
UPPER MICHIGAN, MARQUETTE COUN...

Last edited by NITROUSN; 03/17/20 02:58 PM.






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