how hard is it to make your harness stand alone. i want to get either ls1 or lt1 it will be backed by a t56. but i have a carb. so can i make a harness self interfeed. or how will i get it all to work. i see threads that go from tpi or tbi to the newer engines. but what about going froma carbed specifically a l69 to a newer fi engine.
thanks
jon

 

Your better off buying a used harness on ebay (100-200) or getting a painless. You'll spend the same amount if you have to buy the connectors and pin them yourself. Not to mention one hell of a headache routing it all to work and diving through diagrams.

 

how much is a painless kit. also dont the ls1s and lt1s from ebay come with the harness. is it hard to cut up that harness to make it self feed.

 

Well I thought you were talking from scratch here, its quite common to modify the lt1 harness into the factory harness, thats what I did, the painless kits are anywhere from 500-600 dollars. www.speartech.com is what I would do if your gonna buy a whole new harness for that price, if you send them your old ones you'll save about $250 rather than going with painless and it will be complete plug and play with your old harness rather than replacing the factory fuse box.

 

if i get a new guage cluster and put in the other 2 o2 sensors would i have to modify anything. also i would get a new fuel tank and sending unit and lines.

 

Why does everyone try to make this so confusing ????

After removing the LT1 harness in one piece, its not hard to look at the diagrams, figure out which hookups you need and its a stand alone harness, theres a few ign +, a ground or two, a B + or two, and if auto a park switch feed, just about anything beyond that is optional.

 

me and diagrams dont go together

 

Try this out, www.alldatadiy.com

get yourself a subscription for a 95 firebird with the LT1, take a look at some of the diagrams they're pretty easy to figure out, once you've got the harness using the diagrams and a multimeter its not hard to figure out what you need to hookup where, i promise its only a small handful of wires you actually need for the pcm to run the engine, after that its got an output for tach, speed signal, water temp, two for fan turn on, etc, just break it down a bit, the only real worry i see for you is if you are staying with stock cable driven gauges the obvious lack of a drive for the speedometer on the tailshaft of the T56.

 

if i do the swap it will prob be a ls1