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Discussion Starter · #1 ·
Just curious since I see a 1993 complete unit for sale but I want to put one it a 1989. Will the harness work or is it not worth the hassle?
Thanks!
 

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The harness will not be plug and play. 87-89 are interchangeable in your body. The chassis/dash harness plugs will be different.
 

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Discussion Starter · #3 ·
The harness will not be plug and play. 87-89 are interchangeable in your body. The chassis/dash harness plugs will be different.
OK Thank you!
 

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There is a slight differences in the 87-88 harness and 89 harness.

The secondary harnesses like taillights and doors and fuel pump relay are the same from 87-89 but the two main harnesses, dash and engine have a few small differences in that in how certain wires are routed. One major different of course is 87-88 is speed density and ‘89 is mass air.

since this is the pro-m forum and I don’t know what your intent is, I’ll just say that for the best compatibility all the harnesses should be from the same year.
ProM offers 87-89, 90 and 91-93 for their harness options. Since his car is 93, he needs the 91-93 for plug and play compatibility. I personally would like to know how they offer a harness from 91-93 when there are differences between 91 and 93 harnesses. When it comes to doing a swap, 91 to mid 92 are the same and mid 92 through 93 are the same. I went through this when I was converting my fox to a 5.0. I tried an 89, 90 and 93 harness before finding an early 92 harness that plugged into all of the body connections. 87-89 makes sense cause you can plug an 89 harness into an 87-89 and it will work assuming the user has a maf ecu to go with it.
 

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Just curious since I see a 1993 complete unit for sale but I want to put one it a 1989. Will the harness work or is it not worth the hassle?
Thanks!
I actually had the same issue only reversed. I got a complete setup for an 89 and had to buy a harness for my 93. So I have an 89 harness if you are interested in it. I would make you a good a deal. It does not have the supplemental harness.
 
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Discussion Starter · #8 ·
I actually had the same issue only reversed. I got a complete setup for an 89 and had to buy a harness for my 93. So I have an 89 harness if you are interested in it. I would make you a good a deal. It does not have the supplemental harness.
I will send you a PM. Thanks
 

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Discussion Starter · #9 ·
Does anyone know what a new ProM harness for coil on plug that goes in a 1989 would cost? I don't see the harness listed on their website, assuming it just comes with the kit.
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Does anyone know what a new ProM harness for coil on plug that goes in a 1989 would cost? I don't see the harness listed on their website, assuming it just comes with the kit.
Thanks
I believe the entire harness is different which is why people recommend getting all the options you think you may want at the time of ordering. I dont think its an addon. You essentially would need to rebuild the harness to work with COP or buy a whole new harness from Pro-M.
 
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Does anyone know what a new ProM harness for coil on plug that goes in a 1989 would cost? I don't see the harness listed on their website, assuming it just comes with the kit.
Thanks
If you go into the page for the harness, select your year then it asks if you want COP. COP is an additional 100, so a new harness would cost $1000.
 
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Discussion Starter · #12 ·
If you go into the page for the harness, select your year then it asks if you want COP. COP is an additional 100, so a new harness would cost $1000.
OK thanks!
 
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