okay so I am swapping a TPI setup out of a 89 camaro donor car, don't worry my brother is using it to build he just has aftermarket ecu and harness so I snagged it. I would really like to know what all on the harness I need and what all I can get rid of, I am trying to use my 91 firebird as a template but its speed density and I haven't had to do anything with the harness so I don't really know where things go. I planned on using the chassis harness for the wipers gauges alt ect. I would assume I just need to adapt in a hot wire into the dist and ecu then one from the fuel pump relay to the pump, I do also need to completely bypass the vats setup as that was why the vehicle was parted out before I got it. I was also doing some reading and it mentioned needing a VSS and an oil pressure sending unit but didn't mention why

 

I found this but can it really be that easy to by pass the emission and vats systems just by clipping the wires http://www.rowand.net/Shop/Tech/imag...ter1227727.bmp

I have a moates tuner where I can go in a turn off vats once gain if it is only that simple and the egr you just turn it up so high that it never comes on but I wanna make sure I do it right and don't just hack into the wrong parts of the harness

 

The ecm uses the vss reading and the oil pressure sensor is a back up to the fuel pump relay. Just turn off the vats and the egr in the prom. I don't recall needing anything big to swap into a retro fit. Just the right powers and right grounds. this may help http://austinthirdgen.org/mkportal/m...ine_wiring.gif

 

so do I need the oil pressure sensor and the vss or can I get around it?

 

Use a vss. The ecm uses that. The oil pressure sending unit can be bypassed per se but if the fuel pump relay fails, the engine shuts down. That's the point of the piggybacking sending unit. What good does it do to remove it? Think about it. You're already retro fitting wiring, what's a few wires that are already in the harness?

 

but I don't have a vss on this trans, could I just by pass the fuel pump wiring all together and go with an ign controlled one I do wanna do it right but I dunno how I would get it to read VSS signal... actually I saw one on summit that uses GPS signal for electronic speeds would that work?

 

Add a vss. Not hard.
Don't bypass a relay. That put the load on the switch. Many relays get used just to take the load. Nothing like melted wires or a burned down vehicle to ruin a day.
Never seen a gps speedo, you'll have to research it. Someone else my chime in on it too.

 

I would still use a relay just use the ign power as the trigger

 

That's already the trigger. The op switch is the back up if the relay fails while running.

 

Me and my dad just swapped a 88 tpi into a 1956 Chevy. If you are using the motor and the wiring harness go ahead and use the VSS and the oil pressure switch. I'm not sure why you try to bypass it. You already have it on the wiring harness out of the 89. The VSS goes onto the back of the speedo. So we just used the complete cluster out of the Camaro and modified it to fit into the dash of the 56. But, they also make some after market VSS that use magnets and goes onto the drive shaft. Vats can be over come by getting an after market chip with the Vats turned off. You can also have the smog stuff turned off if you don't have emissions test to pass and remove all that stuff from the engine bay it sure make it look a lot cleaner.

It does make it easier if you label all the plugs as you take the wiring harness out of the donor car. Once you get the motor into the new car and lay the wiring harness out on top of the motor a lot of the plugs will fall into place. We also used the body harness too since the 56 did not have one. We used most of the body harness including headlights, dome light, tail lights, the switches that turn the dome light on and off when you open the door. Some wires may have to be lengthened or shortened or removed all together depending what you need. If you keep as much of the 89 wiring harness together everything should work just like it worked in the 89.

Here's a video of the 56 if you skip all the way to the end you can see the speedo we modified to fit into the 56 dash bezel. We did that so we could use the exact VSS that was in the Camaro. You maybe able to do the something similar with your build so you can keep the VSS. The computer is going to be looking for one.

 

okay the motor is out of a 78 c10 and doesn't have a oil presser sensor or a vss and my brother kept most of the body harness which is no big deal since the body will just get power from the starter and all the truck stuff will work as normal. Okay so it looks like I will have to wait a bit to finish this up cuse I need to get a chip adapter a vss and oil pressure sensor, anyone have a part number for a vss adapter apparently it needs to be a 2000 unit per revolution right? Thanks for your input

 

the motor/trans was long gone before I got the car it's actually in a 77ish nova now. I love the idea of the adapting speedo gives me an idea to do in the elco when I do a 4L or if I win the lotto T56 swap.

 

To make the oil pressure switch work all you have to do is plumb in a T. Go to home depot and buy a brass nipple and a T put the oil pressure sending unit in one side of the T and the oil pressure switch in the other side of the T. Put the nipple in the hole that the oil pressure sending unit came out of.

 

couldn't I just get one from the auto parts store and put it where is would go in the Camaro appears to be plenty of room