HEI vs Sunpro tach install????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

84 400 · 08-02-2006, 10:04 AM

Well guys i must confess i have not benn under the hood that much in the past 2 years except to change the oil and to polish the chrome. I forgot i had the HEI style dis. i thought it was a coil and dis set up not the HEI. Any ways were should i hook the green wire of my aftermarket tach to? i know some of yall have the same tach so maybe you can help. also i went with the 3 inch but have not desided were to mount. also please include were you made the wore connections in the fuse clock and to the dimmer switch. also an shots looking at the wheel from the side would help so i can see were you ran the wires.
Thanks

bigblock73 · 08-02-2006, 12:05 PM

There is a "tach" terminal on the HEI itself. Hook the power wire there, one to a ground, the other to a light source.

SSC's76 · 08-02-2006, 02:30 PM

Most tachometers have 4 wires, ground (black) , 12V (red), light (white) and tach (green). Like BB73 mentioned the green tach wire goes to the spare terminal on the cap. It will actually say battery on one and tach on the other.

As far as placement goes just put it where you can best see it. Guage pods are fairly cheap and very visible when mounted to the piliar.

piecesparts · 08-02-2006, 05:32 PM

Can't miss it, the terminal is on the side of the dist. cap and marked. Get a female spade termianl and plug it in.

magnethead · 08-02-2006, 06:55 PM

what they said. I put mine in (older sunpro from our part's box) and just hose-clamped the mount to the steering column. Put power to the ignition-on lead for the radio, ground to the steering column bracket on the firewall, yet to connect light, and ran green to the tach port of the dizzy.

84 400 · 08-02-2006, 11:14 PM

thanks i did not look at the hei that well i guess. jeff what do those conections look like? are they the flat type? i was going to use a hose clamp and mount it on the coolum so when the truck is in drive the tach is straight up. or on the inside corner of the dash and piller

magnethead · 08-03-2006, 01:34 AM

typical speaker connectrs. Just put a quarter inch speaker syle spade on it and slip it on. Depending on clearences, you may have to remove the dizzy cap to see which terminal it is and get it on right.

piecesparts · 08-03-2006, 10:01 PM

I agree a flat spade style connection on the distributor body. Use a mirro and flashlight to see it. I mounted my tach just above the dash on the "A" pillar, by using a flat piece of aluminum stock from a hardware store and one of the screws that was already on the post (holding the plastic trim). If you don't have the trim drill a 1/8" hole and match the strap to the hole. I cut the end of the strap (that went up by the windshield rubber at the same angle as the rubber and then used that rubber as the brace for the other end. By doing it this way, all I had to deal with was the one hole in the post. I then drilled two holes in the strap and mounted the tach to the strap just above the dash pad. I then ran the wire down through the dash (by the windshield rubber and there was only about a four inch piece of wire exposed.

08-02-2006, 10:04 AM	#1
84 400 Sb 400 club Join Date: Nov 2005 Location: NH / MA Posts: 2,741	HEI vs Sunpro tach install????? Well guys i must confess i have not benn under the hood that much in the past 2 years except to change the oil and to polish the chrome. I forgot i had the HEI style dis. i thought it was a coil and dis set up not the HEI. Any ways were should i hook the green wire of my aftermarket tach to? i know some of yall have the same tach so maybe you can help. also i went with the 3 inch but have not desided were to mount. also please include were you made the wore connections in the fuse clock and to the dimmer switch. also an shots looking at the wheel from the side would help so i can see were you ran the wires. Thanks __________________ 1984 chevy c10, built 400sb,.(SOLD) 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out

08-02-2006, 12:05 PM	#2
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,826	Re: HEI vs Sunpro tach install????? There is a "tach" terminal on the HEI itself. Hook the power wire there, one to a ground, the other to a light source. __________________ Jeff 73-87.com 73-87.com Facebook page 73-87 cab corner 6x9 speaker brackets for sale 67-72 cab corner speaker brackets for sale 47-54 cab corner speaker brackets for sale

08-02-2006, 02:30 PM	#3
SSC's76 No No Join Date: Jun 2005 Location: Pueblo Colorado Posts: 1,781	Re: HEI vs Sunpro tach install????? Most tachometers have 4 wires, ground (black) , 12V (red), light (white) and tach (green). Like BB73 mentioned the green tach wire goes to the spare terminal on the cap. It will actually say battery on one and tach on the other. As far as placement goes just put it where you can best see it. Guage pods are fairly cheap and very visible when mounted to the piliar. __________________ 1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler

08-02-2006, 05:32 PM	#4
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: HEI vs Sunpro tach install????? Can't miss it, the terminal is on the side of the dist. cap and marked. Get a female spade termianl and plug it in.

08-02-2006, 06:55 PM	#5
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	Re: HEI vs Sunpro tach install????? what they said. I put mine in (older sunpro from our part's box) and just hose-clamped the mount to the steering column. Put power to the ignition-on lead for the radio, ground to the steering column bracket on the firewall, yet to connect light, and ran green to the tach port of the dizzy.

08-02-2006, 11:14 PM	#6
84 400 Sb 400 club Join Date: Nov 2005 Location: NH / MA Posts: 2,741	Re: HEI vs Sunpro tach install????? thanks i did not look at the hei that well i guess. jeff what do those conections look like? are they the flat type? i was going to use a hose clamp and mount it on the coolum so when the truck is in drive the tach is straight up. or on the inside corner of the dash and piller __________________ 1984 chevy c10, built 400sb,.(SOLD) 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out

08-03-2006, 01:34 AM	#7
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	Re: HEI vs Sunpro tach install????? typical speaker connectrs. Just put a quarter inch speaker syle spade on it and slip it on. Depending on clearences, you may have to remove the dizzy cap to see which terminal it is and get it on right.

08-03-2006, 10:01 PM	#8
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: HEI vs Sunpro tach install????? I agree a flat spade style connection on the distributor body. Use a mirro and flashlight to see it. I mounted my tach just above the dash on the "A" pillar, by using a flat piece of aluminum stock from a hardware store and one of the screws that was already on the post (holding the plastic trim). If you don't have the trim drill a 1/8" hole and match the strap to the hole. I cut the end of the strap (that went up by the windshield rubber at the same angle as the rubber and then used that rubber as the brace for the other end. By doing it this way, all I had to deal with was the one hole in the post. I then drilled two holes in the strap and mounted the tach to the strap just above the dash pad. I then ran the wire down through the dash (by the windshield rubber and there was only about a four inch piece of wire exposed.



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