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Topic: Tach Problem

in Forum: C3 Electrical


Tach Problem

Posted: 6/1/02 9:29pm Message 1 of 8
Former Member
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Joined: 3/31/2002
Posts: 6
Vette(s): 1975 85% restored
My tach is not working. I guess that it is the printed circuit board. I was wondering if anyone has rebuilt one of them. There does not seem to be much to them. Maybe a trip to Radio Shack could save a few bucks?

Any thoughts?

Thanks


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Tach Problem

Posted: 6/3/02 8:22am Message 2 of 8
Former Member
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Pennsville, NJ - USA
Joined: 3/13/2002
Posts: 532
Vette(s): 1977 EX-L48
I haven't done it myself but it is on the list to do in the future. (Which could be 50 years from now!!) But I heard it was fairly easy. Like you said there isn't much to them.


1977 Corvette EX-L48
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's

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Tach Problem

Posted: 6/3/02 9:01pm Message 3 of 8
Former Member
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DOWNINGTOWN, PA - USA
Joined: 11/24/2001
Posts: 962
Vette(s): 1969 Monza Red Black Conv / Black Vinal hardtop 454/480 Tremec 5 Speed 308 Posi.Black Leather Interior, PS, PW, Air cond., tilt/tele,AM/FM Cass.-5 Pack CD, Hurst Shifter, side pipes 2004 Yellow convertible with black top and black interior
Since we are talking about tachs here....I have a mechanical tach on my '69. If I end up getting absolutely crazy and buy the digital gauges from Dakota, how do I change it to an electronic tach? Is there a wire to tie into in the distributor or does the info come from somewhere else?


Tach Problem

Posted: 6/4/02 8:21am Message 4 of 8
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NANTY GLO, PA - USA
Joined: 4/2/2002
Posts: 358
Vette(s): 1974 Stingray - Hooker Headers and Sidepips
Hey Glenn, I just rebuilt my mechanical Distributor. The main shaft and the tach drive gear were worn badly enough to make the engine jump timing. I dont know for sure on Vettes, but I do know that tachs in other cars run off of the coil wire. I dont know about the digital technology either.


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Tach Problem

Posted: 6/4/02 3:13pm Message 5 of 8
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KENNETT SQUARE, PA - USA
Joined: 4/2/2002
Posts: 20
Vette(s): 1976 & 1987
br75,
First off macke sure the wire at the distributor has a good connection. If so it could be either the filiter or the circuit board. Filters are impossiable to find, but the board is availiable thru Ecklers, etc. Cost about $90.00. You will need to remove tach from the dash which is a job in it's self. Godd luck
Dutch


://http://www.corvetteforum.net/c3/bud_snyder/

Tach Problem

Posted: 6/7/02 1:41pm Message 6 of 8
Former Member
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DOWNINGTOWN, PA - USA
Joined: 11/24/2001
Posts: 962
Vette(s): 1969 Monza Red Black Conv / Black Vinal hardtop 454/480 Tremec 5 Speed 308 Posi.Black Leather Interior, PS, PW, Air cond., tilt/tele,AM/FM Cass.-5 Pack CD, Hurst Shifter, side pipes 2004 Yellow convertible with black top and black interior
Thanks Rick. That worn drive gear could be why I have to keep resetting my timing. Doesn't stay set for more that 2 or 3 weeks at a time. |grrr|


Tach Problem

Posted: 6/11/02 12:10pm Message 7 of 8
Former Member
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NANTY GLO, PA - USA
Joined: 4/2/2002
Posts: 358
Vette(s): 1974 Stingray - Hooker Headers and Sidepips
Glenn, I bought the kit from Rik's for around $80. You get the Mainshaft, tach gear, spacer, and button. This is a great deal. It is a very easy job to change. No presses needed. |hammer|


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Tach Problem

Posted: 6/11/02 5:17pm Message 8 of 8
Former Member
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Eastern part of, CT - USA
Joined: 1/29/2002
Posts: 319
Vette(s): White 73 convertible - 350/auto, A/C PS, PB, PW, leather, t/t, two tops Also had a 69 t-top 20 years ago
The tach filter from newer (80's) cars works: Camaro/Firebird, Monte SS, etc. Try a junkyard? As long as it's an HEI, it will have the right filter.

As far as fitting digital gauges, they should come with any filter they need. Hook the tach trigger wire to either the points side of the coil, or the Tach plug on the side of an HEI, next to the power plug.

Joe


in Forum: C3 Electrical


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