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Help! Frustrated with tachometer repair

bwstreaker

Member
Joined
Jun 26, 2017
Messages
10
Location
Yorktown, VA
Corvette
1968 coupe and 2005 convertible
I cannot get the tachometer in my 1968 to function properly and would appreciate help. I have the original gear drive tachometer in my vette which bounced at low RPMs. I checked the cable and it appears OK. The cable end is also not rounded. I have replaced the side distributor gear and installed an angled cable connector at the distributor so the cable is not bent. After all this, the tach simply bounces between 0 and 500RPMs even when engine speed is increased. What do I need to try next?;shrug
 

tnovot

Active member
Joined
Jan 14, 2011
Messages
44
Location
Streator, IL 61364
Corvette
1975 pearl white 4 speed convert with 355 HP ZZ4
I cannot get the tachometer in my 1968 to function properly and would appreciate help. I have the original gear drive tachometer in my vette which bounced at low RPMs. I checked the cable and it appears OK. The cable end is also not rounded. I have replaced the side distributor gear and installed an angled cable connector at the distributor so the cable is not bent. After all this, the tach simply bounces between 0 and 500RPMs even when engine speed is increased. What do I need to try next?;shrug

I assume you have already removed all old and/or hardened lube from the cable and relubed it with a high quality white lithium grease?
 

bwstreaker

Member
Joined
Jun 26, 2017
Messages
10
Location
Yorktown, VA
Corvette
1968 coupe and 2005 convertible
Thanks for the reply tnovot. Yes I did put new grease on the cable. I am having trouble keeping the coupling holding the tach drive cross shaft gear tight in the distributor.
 

GTR1999

Well-known member
Joined
Sep 4, 2003
Messages
1,146
Location
New Haven CT
Corvette
1969,1972,1975
I have not rebuilt a tach drive distributor for several years now but the last two I did I found the quality of the new cross gears terrible- At BEST. These came with a brass button on the end and I was told I had file the button to set the gear lash, well that was total BS. I set it up in a lathe and face the button a few thousands and nothing helped, I removed the button made my own and had the same result, returned 3 of them all the same- junk. I found an old used GM cross gear and it worked perfect. you may be chasing your tail with bad parts.
 

bwstreaker

Member
Joined
Jun 26, 2017
Messages
10
Location
Yorktown, VA
Corvette
1968 coupe and 2005 convertible
Gary, you might be right !! I have now put in two new gear sets with the same results. In neither case did I use the brass button and I thougyt that might be my problem. Ray
 

GTR1999

Well-known member
Joined
Sep 4, 2003
Messages
1,146
Location
New Haven CT
Corvette
1969,1972,1975
I can only guess the new ones haven't been corrected then, the ones I had and this goes back about 8 years or more, were clearly bad. The main shaft gears had issue too if I recall on the new ones I bought, but that brass tipped type would not engage without binding. I don't rebuild a lot of tach drive distributors but I do a lot of differentials, steering boxes, and arms and can tell you that some of the replacement parts for those are also bad. Luckily I have good resources and in the case of the boxes I have a huge inventory of new parts that do work.
 

Red89C4

New member
Joined
Jun 20, 2009
Messages
3
Location
Brick, NJ
Corvette
1989 Bright Red Coupe A4
I went thru the "gear fitment" issue a short time back on my 72 Vette. The only complete repair I was able to accomplish was to send the O.E. distributor out to a vendor off Ebay. The price was cheap...less then $100 as I remember....and it was guaranteed and works fine now.
 

bwstreaker

Member
Joined
Jun 26, 2017
Messages
10
Location
Yorktown, VA
Corvette
1968 coupe and 2005 convertible
Thanks for the reply Red89C4. I am to the point where I will probably do the same thing.:)
 

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