help installing a tach! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TireSmoke420 · 01-09-2007, 03:27 PM

ok guys i got a tach for my truck but now i have no idea what wire to hook it to on the coil. there are 4 wires on it i think i know it goes to the negative side but what side is that? thanks

Russell · 01-09-2007, 03:33 PM

Tach wires goes to the white wire coming off the ignition coil, it is on the same connector as the thick red wire that supplies power to the coil. The other two wires go to the distributor

This is assuming you are talking about your 87, and it is still TBI

84 400 · 01-09-2007, 03:34 PM

your 87 is hei right? It should be labled on the hei

EDIT: sorry i thought tbi had hei and not a seperate coil and dizzy

TireSmoke420 · 01-09-2007, 05:08 PM

no 87 isnt hei. my 69 was

01-09-2007, 03:27 PM	#1
TireSmoke420 One of the few GMC'ers Join Date: Jul 2005 Location: Des Moines, Iowa sometimes Butler, PA Posts: 146	help installing a tach! ok guys i got a tach for my truck but now i have no idea what wire to hook it to on the coil. there are 4 wires on it i think i know it goes to the negative side but what side is that? thanks __________________ 87' Silverado 4x4 "Young, Dumb And Full Of Cum"

01-09-2007, 03:33 PM	#2
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Re: help instaling a tach! Tach wires goes to the white wire coming off the ignition coil, it is on the same connector as the thick red wire that supplies power to the coil. The other two wires go to the distributor This is assuming you are talking about your 87, and it is still TBI __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

01-09-2007, 03:34 PM	#3
84 400 Sb 400 club Join Date: Nov 2005 Location: NH / MA Posts: 2,746	Re: help instaling a tach! your 87 is hei right? It should be labled on the hei EDIT: sorry i thought tbi had hei and not a seperate coil and dizzy __________________ 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 Last edited by 84 400; 01-09-2007 at 03:35 PM.

01-09-2007, 05:08 PM	#4
TireSmoke420 One of the few GMC'ers Join Date: Jul 2005 Location: Des Moines, Iowa sometimes Butler, PA Posts: 146	Re: help instaling a tach! no 87 isnt hei. my 69 was __________________ 87' Silverado 4x4 "Young, Dumb And Full Of Cum"



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