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6/22/14 10:01pm - Original Message: ' Mirror and Tach '
tinbender
Former Member
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edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736
  I have an convertible , my first question is how do I tighten the windshield mirror it's lose and the second one is when I'm driving the tach  is reading  close to speed I'm driving...doing 50 tach reading 45 to 50 rpm. Is this normal?
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6/23/14 11:39am - Reply: 'Re: Mirror and Tach '
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19545
On the mirror, it depends on where it is loose.There are a couple of different pivot points, and any of them could cause it to flop. There is a ball/socket that is part of the mirror itself, and that attaches with a screw tot he other part of the hanger that is screwed to the windshield header. The top piece(at the header) can be removed, and a screw inside tightened to help. If the mirror itself is flopping on the ball/socket where the arm comes out of the back of the mirror, that will require removing the glass to try to tighten it up inside....Ouch

Someone here just replaced the glass in their mirror...perhaps they took some pics....

On the tach, the problem is either going to be with the tach filter, or the gauge itself. Try disconnecting/bypassing the tach filter and see if that makes any difference.




|UPDATED|6/23/2014 9:39:00 AM (AZT)|/UPDATED|


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Joel Adams
C3VR Lifetime Member #56    
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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6/23/14 1:09pm - Reply: 'Re: Mirror and Tach '
knotacare
Standard Member
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Newark, DE - USA

Vette(s):
1968 Conv, 454HO,500HP-600TQ, TKO-600,3:70 HD rear,hotrod air, custom paint & suspension,1973 Ruby Red,T-top, 383 Stroker, TK)-500,frame off restro, 1977 Yellow (1 of 51 ) L-48 4 spd, 99% original.

Joined: 7/26/2004
Posts: 458
Sometimes you can remove the bottom stops  that keep the glass from going to low & drop the glass in the door . This gives you enough room to tighten the mirror . This is a lot easier than removing the glass from the door.  The earlier C-3's are pretty tight, but I think it will work on a 75.
Alan


|UPDATED|6/23/2014 11:09:21 AM (AZT)|/UPDATED|


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6/23/14 4:44pm - Reply: 'Re: Mirror and Tach '
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19545
Alan, he's talking aboot the inside rear view mirror...the one in the center area of the windshield. Big smile

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Joel Adams
C3VR Lifetime Member #56    
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             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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6/23/14 6:37pm - Reply: 'Re: Mirror and Tach '
dyoes
Former Member
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Zachary, LA - USA

Vette(s):
1974 L-48 Auto. Just your basic Vette. GM crate motor w/vortec heads and intake. Crane cam. Scorpion rockers, Edelbrock carb. Lots of parts still in boxes... :(

Joined: 1/27/2013
Posts: 201





|UPDATED|6/23/2014 4:37:56 PM (AZT)|/UPDATED|


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6/23/14 8:00pm - Reply: 'Re: Mirror and Tach '
tinbender
Former Member
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edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736
Where would I find the tach filter

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6/23/14 9:11pm - Reply: 'Re: Mirror and Tach '
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19545
Normally not too far from the distributor.It will be in the wire that goes to the "Tach" terminal on the cap. The filter willa lso be bolted down to something so it will be grounded...not sure exactly where it would be on the '75, but if you follow the tach wire down from the dist., you should find it.

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Joel Adams
C3VR Lifetime Member #56    
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             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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6/24/14 10:27am - Reply: 'Re: Mirror and Tach '
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
The filter should be bolted to the intake manifold. You can disconnect it from the "tach" output of the distributor and bypass it by plugging the wire from the firewall right into the distributor. It may be the tach board is bad as Joel has said. I replaced mine last year. Not a difficult job but it takes some time and patience to do.

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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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