Help With Mechanical Driven Tachometer
Thread Starter
Cruising
Joined: Aug 2010
Posts: 13
Likes: 0
From: Portland OR
Help With Mechanical Driven Tachometer
My 74 Vette has a mechanically driven tachometer. It doesn't work. The distributor is an aftermarket Excel model 30100T, which seems to be obsolete; it doesn't appear any longer in reference books. My observations are that the tach drive gear is pretty well toast. Although the main drive gear hasn't been removed, I suspect it is too. While the parts people say it won't be difficult replacing the main gear, finding the tach drive gear is another story. Can anyone help me with locating the necessary part so that the tachometer will function properly.
Thanks.
Fox
BTW, the car runs beautifully with the existing distributor; I just want the tachometer to work.
Thanks.
Fox
BTW, the car runs beautifully with the existing distributor; I just want the tachometer to work.
Burning Brakes
Joined: Jul 2009
Posts: 1,240
Likes: 294
From: ESCONDIDO CA
2025 C2 of the Year ('63 and '67) Finalist - Unmodified
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I would guess that it's the same for all tach drives. Eckler's, Zip, Corvette Central, all will carry that gear. Good luck, it's nice to have a working tach.
Cruising
Joined: Jan 2011
Posts: 14
Likes: 0
From: Califonia
i have a 74 too with tach problems...mine is the tach cable breaks inside the tube because i run such a high advance that it hits the fire wall but thats probable not your problem.... what main gear is not working? the one in the dist. or the gears in the actualy tach?
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 99
From: Ontario
i have a 74 too with tach problems...mine is the tach cable breaks inside the tube because i run such a high advance that it hits the fire wall but thats probable not your problem.... what main gear is not working? the one in the dist. or the gears in the actualy tach?
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
75-77 vette has electronic tach, and far better/reliable than any mechanical POS....
do what I did 15 years ago....switch it out...and never look back...
I got lucky and swapped my old mechanical drive points dizzy for one with the local vette shop owner....
do what I did 15 years ago....switch it out...and never look back...
I got lucky and swapped my old mechanical drive points dizzy for one with the local vette shop owner....
