chevyguy93

I've been reading posts about putting a tach into automatics. I've bought a tach for about $40 canadian, and it looks pretty good. It's only got settings for 4-6-8 cyls. Now, i here that i can just hook it into the wire that comes off the coil packs, or what ever it's called, hehe. But there's 2 of them, and so i'll only be getting half a normal reading. I don't got money to go out and buy a "converter" to amplify it. Is there anything else that i can do? I'm great with electronics, and do repairs. does anyone have a schematic or know what's inside one of those converters? Or if theres any other places i could tap into to get a full rpm reading. From what i understand, there should be a tach wire somewhere for mechanics. hmm. Anyways, thanks for the help. i'll check back soon to read replys =P

hopeless4life

If ur car is fuel injected the tach signal will be stronger at an injector, There will be one wire that will be common to all the injectors, thats the wrong one. use any one of the uncommon wires. In your car their should be more wires than that at the coil pack though, In Gms the white wire at the coil pack is generally the tach wire, or it could be a purple white. either way i hope this helped

chevyguy93

Oh. i forgot to say. it's a 4 cyl. distributorless. not fuel injected.

EnjukuRacing240sx

it is a purple and white wire. splice off that youll be golden

chevyguy93

and where would i locate this purple and white wire? I've searched before, but had no success.

hopeless4life

Follow your spark plug wires from the spark plug back. At the end of the spark plug wires there should be a coil pack or a distributer. At that there should be a plug, with wires coming off of it. Tap on to either the white or the purple white for your tach signal.

chevyguy93

but isnt there 2 coil packs? which then when hooked to my tach, my signal will only be half of what it should be. so the tach will be wrong.
aint i right?

noshun

It shouldn't but if it does then splice into both!!!!!!!!!!!!

__________________
Red Z24 = Dead, 03 2 door = 15.5 with no traction. low 15's here i come

'Never forget Grasshopper, Not speed, smile!'

chevyguy93

haha, yea. splice into both . i thought there were 2, 1 per 2 cylinders or something like that. i'll look next time i get a chance too.

hopeless4life

Its like talkin to an FN brick wall sometimes

hopeless4life

tap it on to the damn purple white or white already, if it don't work then ask again.

noshun

Alright Guv'na calm it!

__________________
Red Z24 = Dead, 03 2 door = 15.5 with no traction. low 15's here i come

'Never forget Grasshopper, Not speed, smile!'

chevyguy93

hmm. well. i tried, it dont work! lol. shows half the rpms.

noshun

bet you didn't try both!

__________________
Red Z24 = Dead, 03 2 door = 15.5 with no traction. low 15's here i come

'Never forget Grasshopper, Not speed, smile!'

EnjukuRacing240sx

im bettin the same thing