tach drive ?
Race Director
Joined: Apr 2002
Posts: 11,485
Likes: 1
From: Far side of the Moon
CI 4-5-6-7-8 Veteran
St. Jude '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-16-'17
Re: tach drive ? (danzig74c)
Looking at the photo and I'd say there isn't a tach drive connection on it.
The tach drive connector looks just like a speedometer connection (actually, it basically IS a speedometer connetor) as is located opposite the vacumm advance under the base plate. Simplier put, the tach drive connection would be about 90 degrees to the right of your arrow and is about as big around as a nickel.
Question, this is off a 74, did the 74's have a mechanical tach or was it electric. My 73 is mechanical, not sure what year they converted to electic.
The tach drive connector looks just like a speedometer connection (actually, it basically IS a speedometer connetor) as is located opposite the vacumm advance under the base plate. Simplier put, the tach drive connection would be about 90 degrees to the right of your arrow and is about as big around as a nickel.
Question, this is off a 74, did the 74's have a mechanical tach or was it electric. My 73 is mechanical, not sure what year they converted to electic.
Team Owner
Joined: Jun 2001
Posts: 43,136
Likes: 155
From: Thomson Georgia
Re: tach drive ? (gb4622)
[
Question, this is off a 74, did the 74's have a mechanical tach or was it electric. My 73 is mechanical, not sure what year they converted to electic.
[/QUOTE]
Yes the last mechanical tach drive was in 74.........:LOOKS like you are missing the adapter where the cable screws in
[Modified by Alwyn678, 7:14 PM 7/14/2002]
Question, this is off a 74, did the 74's have a mechanical tach or was it electric. My 73 is mechanical, not sure what year they converted to electic.
[/QUOTE]
Yes the last mechanical tach drive was in 74.........:LOOKS like you are missing the adapter where the cable screws in
[Modified by Alwyn678, 7:14 PM 7/14/2002]
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: tach drive ? (danzig74c)
See Dennis, I told you so :D
I'd get a new one if I were you, this one looks pretty hosed :( (or a good used one). They are pretty expenisve though. Or you could get an electronic tach and distributer, might be more economic and definetely more reliable in the long run
I'd get a new one if I were you, this one looks pretty hosed :( (or a good used one). They are pretty expenisve though. Or you could get an electronic tach and distributer, might be more economic and definetely more reliable in the long run
Le Mans Master
Joined: Jul 1999
Posts: 7,072
Likes: 4
From: Maryland
Re: tach drive ? (danzig74c)
On my '70 the tach cable goes on the other side from the vac canister thinggie. ie, the vac connector is on the pass side, the tach hookup is on the driver side. I don't know if they changed by the time yours was built though.... ~Juliet
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Le Mans Master
Joined: Aug 2000
Posts: 9,662
Likes: 7
From: Semper ubi, sub ubi
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: tach drive ? (danzig74c)
Dennis, that doesn't look like my tach drive distributor. If you need a tach drive distributor check with Lars and see if he might have one. Another possibility is to check EBay, usually there are a few Corvette tach drive distributors for sale there. It will probably be in rough shape, but Lars or Tom454 can do a good job rebuilding it for you. I rebuilt my own with parts from Zip and Lars for less than $100.00. It is as good as new.
Burning Brakes
Joined: Jul 2000
Posts: 963
Likes: 0
From: melbourne,Australia
Re: tach drive ? (danzig74c)
There are a number of brands of distributor avail that let you keep the mech tach drive but give you electronic ignition....this is so that you can keep your stock tacho in the dash......if you dont mind swapping the tach guage for a later electronic one then you can use a later model distributor w/o the mechanical drive.....74 was last year for mech drive tach...john :chevy
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: tach drive ? (danzig74c)
i see i could better buy a new tach meter electronic i geuss....
I didn't know your distributor was THAT hosed until I saw it last Sunday.
Try to get a used one first and it all else fails it's electronic time. I don't have a vac. advance distributor anymore (except for the malloy one I need for my own engine) I only have el. HEI ones.
Let me look around for you what I can find (cheap)
Marck