i have a 98 hyundai accent as a winter beater and the car has a 5 speed but no tach (which i think is stupit when a company duz this) but any ways i got an aftermarket tach and it said hook it up to the green with yellow strip wire under the dash and the damn thing still dont work so i was looking at some other web sites and one person said "piggy back the reading wire to #1 fuel injector wire" now i ask them which wire is this and no replay so i am going to ask you guys who answer most of my ? (thank you for doing so) so what i am asking is piggy backing the reading wire to #1 fuel ingector wire going to work and if so what wire would that be

 

well i hooked it up to the fuel injector wire but somethings not right at idle it says its pushing 200 rpms so i was thinking it might be a bad ground so i sanded down the metal to insure a good ground and check the setting on the tach and its set at 4 cyl so i have no clue y it has so low rpms

 

It has low RPMs because it is registering every time the injector hits instead of the actual RPM. What are the specs of the engine? This info will help narrow down the search. There are a few ways to do this, the yellow strip wire under the dash is what the manufacturere recomends so this is the way that is most desirable. I would trouble shoot that first before trying to rig something else up. You are going to need to figure out why that way doesnt work first. meanwhile, get the engine info and I will do somwe research for you, or you could do it yourself. Google is your friend. www.alldatadiy.com is a good one too.

 

well i was doing some thinking and your right cplthomas hooking it up to the fuel injector wire is not right cause its only going to open once for every two rpms and I am pretty mad at the guys Hyundai forum for telling me to do so. But I have no idea why we aren't getting a reading from the green wire with a yellow strip which is what the instruction tell me to hook it to but its a 98 Hyundai Accent two door with a 5 speed manual with a 1.5L 4 cylinder

 

I am at work now and have limited access to the net... stupid army and stupid blocked sites...
You need to locate a schematic of the wiring harness. typically the wire you are looking for is somehow atached to the dizzy, it registers the rotation of the crank, perhaps the CPS would work as well. Of course the car might have some other kind of set up where this wont work. You might need to get a haynes manual or find one on-line that would tell you where the typical hook up for a tach would be.