Gauges not working after swap. - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 19 (permalink) Old 01-25-2018, 10:55 PM Thread Starter
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I'm finishing up swapping a 7.3L idi into a 2000 f550 super duty. The engine runs and runs well in its new home but the gauges dont work. I know the tach wouldnt work, but thought the temp gauge would work if i used the powerstroke temp sensor.

Wasnt able to use the powerstroke oil pressure switch it is a oring boss fitting, the idi is npt. But the 92 f350 uses a dummy gauge like the 2000 f550, so the pressure switch from the idi should work.

The fuel gauge and the voltmeter both are working.
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post #2 of 19 (permalink) Old 01-26-2018, 01:55 PM
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Re: Gauges not working after swap.

the temp and oil gauges are computer triggered so they will not work with the idi
get an under dash gauge panel with aftermarket gauges, and mount it in a visible place.

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post #3 of 19 (permalink) Old 01-26-2018, 03:52 PM Thread Starter
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How do the Cummins guys keep their stock gauges working? I doubt the Powerstroke pcm can control Cummins especially the older mechanical Cummins that are self contained much like the idi.
I know the idi dont use the pcm when it comes to diesels you cant get much more simplistic than the IDI. But i was under the impression the pcm would still work the cluster as long as it was seeing inputs from the sensors.
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post #4 of 19 (permalink) Old 01-26-2018, 03:56 PM Thread Starter
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I think i know what may be going on, the psd fuel pump and the pcm share a fuse in tge power distribution box under the hood dont they?
Because i pulled the relay for the IDM, the fuse for the IDM, and the fuse for the fuel pump to disable the factory pump since it is now bypassed with a new fuel line.
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post #5 of 19 (permalink) Old 01-26-2018, 05:27 PM
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Re: Gauges not working after swap.

no idea, i have never messed with swapping an older engine in a newer truck.

and i do not mess with cummings engines at all except to run them over the scales at the scrap yard

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post #6 of 19 (permalink) Old 02-02-2018, 07:15 PM Thread Starter
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Ok so i have it solved, the pcm and fuel pump do seem to share a fuse. I also had yo fix a broken wire at the 42 pin plug for the oil pressure gauge. The idi oil pressure switch does work with the psd pcm.
Now the only issue i have is i cant seem to get the alternator to charge.
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post #7 of 19 (permalink) Old 02-02-2018, 07:25 PM
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Re: Gauges not working after swap.

What alt are you running?
Is it a 3g One? Maybe toss up a pic.

01 f-250, Standard
Rev tech 4" lift, 37" military wrangler Mt tires
KC diy 66, Full force 160/100 and custom tunes from PHP
Banks intercooler and full 4" exhaust, Diy S&B intake
Diy quad feed, Hydra, Isspro boost, pyro, and fuel pressure
3/0 battery cables with military style terminals
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post #8 of 19 (permalink) Old 02-02-2018, 10:40 PM Thread Starter
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Leece Neville (prestolite) 165 amp ambulance package. The idi came from a retired military ambulance.
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post #9 of 19 (permalink) Old 02-03-2018, 01:45 AM
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Re: Gauges not working after swap.

Did the 2000 have dual alternators? Dual alternators are PCM controlled, so you may need to do a bit of rewiring with the 92 harness to get it to charge.

96 F250 SC/SWB/4X4 XLT Just a 7.3 with a bunch of the usual bolt-on crap
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post #10 of 19 (permalink) Old 02-03-2018, 04:35 AM
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Re: Gauges not working after swap.

The 1g alternator is externally regulated and the 3g/4g alts are internally regulated. So I'm not sure what comes on an ambulance. A pic of the connectors will help.

01 f-250, Standard
Rev tech 4" lift, 37" military wrangler Mt tires
KC diy 66, Full force 160/100 and custom tunes from PHP
Banks intercooler and full 4" exhaust, Diy S&B intake
Diy quad feed, Hydra, Isspro boost, pyro, and fuel pressure
3/0 battery cables with military style terminals
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