bjamick

iTrader: (31)

So I put an ls1 cluster from 00 z28 into my 87 mustang. I’ve got blinkers to function along with lights and all. However my voltage gauge, oil pressure just acts weird and starts at like 60psi and then maxes the gauge once running. As for temp gauge I’m not sure if it’s working yet cause I haven’t ran it long enough. Also the tach isn’t working! I tapped into the serial data wire on the obd2 port and ran it to the cluster. Also hooked up the other needed wires to get other things to work.

To make sure it’s not a cluster issue I pulled the working one out of my trans am and it did same thing. Then put the mustang cluster in my trans am and everything functioned as it should.

Forgot to add it’s a 99-02 5.3 harness.

Anyone know what’s going on?

bjamick

iTrader: (31)

To make it more confusing, with hptuners connected the tach works on my laptop.

StephenWT

StephenWT

bjamick

iTrader: (31)

I would say you’re in much better shape since you have an f-body harness. I’m worried the 5.3 harness serial data wire doesn’t carry the same info as the f-body pcm does.

ls1nova71

iTrader: (4)

Do you have all the wires hooked up to the cluster? What diagram did you use tor the pin outs on the cluster? Im pretty sure there is a dedicated white wire for the tach, is that hooked up to the cluster?

bjamick

iTrader: (31)

I used this pin out and hooked up what I though needed to be.
https://www.thirdgen.org/forums/ltx-...ed-camaro.html

As for my mustang cluster I use this one on page 2:
https://www.stangnet.com/tech/cluster87-93.pdf

I’ve got the power wire hooked up and the blinkers and high beam light.

As for tach wire, an ls1 cluster doesn’t have a tach wire it’s supposed to use the serial data wire from obd2 port.

brandon6.0

iTrader: (32)

Maybe a bad cluster?

bjamick

iTrader: (31)

I thought about that, but checked it in my 99 trans am and it worked find besides oil pressure being off.

Burning

iTrader: (1)

How did you hookup the fuel level? Isnt the serial data controlling the fuel level?

bjamick

iTrader: (31)

Ran it to red pin #54 on my pcm. I installed a 12 gallon fuel cell in my car with a fuel sending unit.

SwapStang

I just installed a 2000 Camaro cluster into my lq4 2001 mustang. I had a 2000 6.0 harness. I tapped the serial wire and that gives you Fuel, coolant temp and Tach. Battery just picks the signal up from its source so as long as there is 12+ volts that should be fine. Speedo gets a signal from red connector pin 50 I believe. Oil pressure comes straight from the sensor on the block behind the intake. And just like you I ran my fuel level sensor into the pcm and recalibrated it to work correctly.


If you have the oil pressure wired correctly I'm guessing the sending unit is bad. It's pretty common especially on an old sensor. The voltage is baffling but combined with the tach maybe its a bad ground? Let the coolant come up to temp and see if its working. If its just the tach left that's acting up something from the pcm must need to be changed? I'd double check all your wiring. Are you saying the Tach comes on when hptuners is connected or that the tach in the scanner of hptuners is displaying a reading?

bjamick

iTrader: (31)

SwapStang

I have mine running fine with a 2000 pcm from a 2500. The only bastard pcms I've heard of were the 98 fbodys. I've had no issues with older truck pcms at all. I'd have to say something is a miss with the wiring to the cluster.

bjamick

iTrader: (31)

G Atsma

WOW. So glad you got it working! As you found, few simple boo-boos can mess things up! Have a joyous Christmas!

SwapStang

bjamick

iTrader: (31)