Topic: Tach filter connection
in Forum: C3 Electrical
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Former Member
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MARYSVILLE, WA - USA
Joined: 10/22/2006
Posts: 129
Vette(s): 1976 stingray, L48 COUPE, TH350 Automatic WITH A ZZ4 355 HP 350 C.I. MOTOR, 750 cfm HOLLY, EXTERIOR RED, INTERIOR BUCKSKIN, SMOKE BLACK GLASS TEE TOPS.
On my 76 I'm converting to a ZZ4 motor and can't figure out the connection of the electronic tachometer filter wiring to the distributer.
Can anyone post a picture of how thier tach filter connects to thier distributer? I see one plug in for the tach wire input from the firewall to the distributer and can't figure out how the two plugs from the filter are attached......Is thier another connector I'm not seeing somewhere on the engine harness ????
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Former Member
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Yelm, WA - USA
Joined: 7/12/2007
Posts: 356
Vette(s): 1979 L82 4 speed Scat 383 crank 190 cc Procomp Aluminum Heads 202 160 stainless valves GM Powder metal rods Speedpro H860CP Hypereutectic pistons 280 cam hydralic HEI Pro comp 1.6 roller rockers Mighty Demon 750 Sanderson CC1AP Hedders.
I got a good GM drawing of the tach filter but my computer decided to take a dump on me this weekend, once I'm all the way back up I'll look for the schematic I have.
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
HERE'S the GM diagram for the tach filter...
One side of the filter plugs into the dist. at the "Tach" terminal, and the other end plugs into the wire going inside to the tach. Be sure to bolt/screw the filter down to something that will give it a good ground...it won't work if it's not grounded.
One side of the filter plugs into the dist. at the "Tach" terminal, and the other end plugs into the wire going inside to the tach. Be sure to bolt/screw the filter down to something that will give it a good ground...it won't work if it's not grounded.
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Former Member
Send PM
MARYSVILLE, WA - USA
Joined: 10/22/2006
Posts: 129
Vette(s): 1976 stingray, L48 COUPE, TH350 Automatic WITH A ZZ4 355 HP 350 C.I. MOTOR, 750 cfm HOLLY, EXTERIOR RED, INTERIOR BUCKSKIN, SMOKE BLACK GLASS TEE TOPS.
Thanks Joel, I was connecting the plug on the brown wire comming from the firewall to the tach connection on the distributer rather than the plug from the filter. So I should be ok if I follow your connection discription. Thanks for the drawing also!
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
No prob Carl!
That graphic is actually an engineering/spec drawing for the tach filter, best I can tell. I "stole" it from someone else that posted it here...might have been Jason(79rebuild). I see something like that, and I'll save it in my "Tech Diagrams" folder on me 'puter...for future reference.
That graphic is actually an engineering/spec drawing for the tach filter, best I can tell. I "stole" it from someone else that posted it here...might have been Jason(79rebuild). I see something like that, and I'll save it in my "Tech Diagrams" folder on me 'puter...for future reference.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Former Member
Send PM
Yelm, WA - USA
Joined: 7/12/2007
Posts: 356
Vette(s): 1979 L82 4 speed Scat 383 crank 190 cc Procomp Aluminum Heads 202 160 stainless valves GM Powder metal rods Speedpro H860CP Hypereutectic pistons 280 cam hydralic HEI Pro comp 1.6 roller rockers Mighty Demon 750 Sanderson CC1AP Hedders.
Thanks for keeping that Joel! I acquired it(sounds better than stealing) from someone else 
but the internet's for sharing information, so have at it. I just got my computer back to where it's not crashing every 2 minutes and all my good data is on my storage hard drive. I got online classes going on right now so right now so I gotta keep it up and running untill I figure out what went wrong with it. I'D MUCH rather be working on my baby out in the g-rage that's fer sure!
but the internet's for sharing information, so have at it. I just got my computer back to where it's not crashing every 2 minutes and all my good data is on my storage hard drive. I got online classes going on right now so right now so I gotta keep it up and running untill I figure out what went wrong with it. I'D MUCH rather be working on my baby out in the g-rage that's fer sure! in Forum: C3 Electrical
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