89 f150
Just swapped in a 302 with MAF conversion.
HO cam and mustang A9L ecu
Running through cam break in right. Now.
My aftermarket gauges show I have oil pressure and temperature is good. But my dash doesn't show oil pressure or water temp. Both sensors are installed and hooked up


Is there some changes in wiring I need to do to make the sensors work??

Roller cams don't need a breakin but you won't damage anything.

Motor is from a 1990 mines a 1989 the connections plugged in but maybe there is a different pin?

Seemed a little slugish at higher rpm.

Here's a video of it running and speeding up for the highway

1. Did you use a kit or did you work out the wiring yourself?
-Bought a harness from runne-rite.com

2. Where did you find the EEC connectors to add the new
wires (for injectors, MAF sensor, etc) to the EEC?
-On the harness

3. What MAF meter did you use?
-Used a mustang g A9L ecu as I have a manual transmission. And the MAF Meter to go with it

4. What size injectors did you use?
-Stock 19lb injectors from my 5.0

5. I noticed that the wiring diagram for our trucks only show one wire for VSS and the A9L wiring diagram show two (one for VSS+ and one for VSS-). How did you handle that?
-Guessing that's built into the harness like how the harness splits the single O2 sensor reading to satisfy the ecu looking for 2.


I also switched to roller lifters and a ho firing order cam.

What exhaust is on it? I had the same cam in my '90 and it ripped at higher rpms but the truck had longtubes and a 3" single exhaust.

There are a bunch of things on different pins with the Mustang PCM but the conversion harness should take care of all of that including feeding the single O2 to both inputs.

For exhaust there is long tube headers with 2.5" true duals and flowmaster super 44 with side exits.


Yeah not many of the wire colors match haha.

So I should swap around the wires so they match correct? That might make it run better too haha

Well 14 out of the 31 wires match lol

Some colors aren't in the other harnesses like the 5.0 has 3 black/yellow the 4.9 has one

Only 2 wires I couldnt figure out in the 4.9 are.
In connector C110
-there is a violet ish colored wire

In connector C113
- black/orange dots

Will need to find the 1990 wiring to figure out those ones. Happen to have that somewhere?

So turns out that a bunch of wire colors changed.
All but 4 of them paired up correctly wheb plugged in.


The IDM feed back to ecu and high coolant temp switch. Were backwards.
No idea what the IDM really does lol

And the oil pressure switch was backwards with the R/Lb #32 wire in the picture which I have no idea what it does

Ok I'm at a loss I still have no coolant temp or oil pressure showing on my dash even after swapping the wires around....

It runs 100x better after swapping the wires around. But still no gauges.

Could the Mustang ecu with the MAF swap have anything to do with the gauges?

Well I know where they go to the plugs from the motor to the body harness.
I'm just not sure from there. Is that something that runs through the ecu?

The coolant temp might be an ecu thong tho?