Cluster help
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Trailering
Joined: Apr 2023
Posts: 22
Likes: 3
From: Alberta Canada
Cluster help
I recently took apart my cluster and swapped out the tach unit and the fuel gauge and oil pressure and etc units while leaving the original PSOM and now my speedo doesn't work, it starts to climb to 20 km/h when I'm doing like 60. The tach doesn't seem to come back down when I let off the gas but my truck also does seem to be idling strangely since I did this. All other gauges seem to half work but don't know for sure.
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Trailering
Joined: Apr 2023
Posts: 22
Likes: 3
From: Alberta Canada
Update: after driving it some more most of the gauges seem to be working normally except for the speedo. While I'm doing 100km/h (60mph) it seems to think I'm doing 60km/h. Is it possible the conversion constant changed while I had it off the truck?
Mountain Pass
Joined: Jul 2021
Posts: 107
Likes: 28
From: Indianapolis IN
no there is no switch. Both MPH and K are on the gauge face. One on the inside and one on the outside. You can program the PSOM for tire size but I’m near certain this couldn’t happen by accident. I will say though the clusters are not completely interchangeable from 92-96/97hd. And neither are the gauges. As in you can not replace a 92 cluster with a 96 cluster.
Hotshot
Joined: Jun 2015
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Thread Starter
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Trailering
Joined: Apr 2023
Posts: 22
Likes: 3
From: Alberta Canada
Hey everyone, think I figured it out. When j went to check calibration of the PSOM and it did its sweep but didn't reach the other end of the speedo. Although when there's no voltage applied to the PSOM the needles move freely, it still matters what position the needle is in when you place it back on the PSOM. I moved the needle to a higher position on the speedo and it seems to be closer to my actual speed. Needs some fine tuning to get it more accurate but figured it doesn't make much sense that the needle moves freely when off the vehicle but the it has to be placed on the exact spot it was removed from.
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Mountain Pass
Joined: Jul 2021
Posts: 107
Likes: 28
From: Indianapolis IN
yes that is correct. Except all 1997 250s aren’t the same. Just the HD model has the PSOM cluster. I believe that you can change some of the pinouts to make them work outside of the compatibility you’ve stated but that’s something you’d have to research by looking at the schematics for each truck. Somebody will correct me if I’m wrong but I’m pretty sure that is the case.
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Mountain Pass
Joined: Jul 2021
Posts: 107
Likes: 28
From: Indianapolis IN
Hey everyone, think I figured it out. When j went to check calibration of the PSOM and it did its sweep but didn't reach the other end of the speedo. Although when there's no voltage applied to the PSOM the needles move freely, it still matters what position the needle is in when you place it back on the PSOM. I moved the needle to a higher position on the speedo and it seems to be closer to my actual speed. Needs some fine tuning to get it more accurate but figured it doesn't make much sense that the needle moves freely when off the vehicle but the it has to be placed on the exact spot it was removed from.
Mountain Pass
Joined: Jul 2021
Posts: 107
Likes: 28
From: Indianapolis IN
I must have read that wrong. I didn’t realize you had removed the needle. Every time I’ve removed a PSOM needle I’ve applied 12v to the PSOM on the bench and then with no input signal going into it I’ve reinstalled the needle just off the stop peg on 0mph. If you turn your truck to the on position before you take the needle off you’ll see where to reinstall it with 12v applied. Hopefully that’s what you are talking about.
Maybe you can see from this photo how far the needle sits off the peg when it has power but is not in motion. It’s not much. That’s why I recommend checking before taking the needle off.
Hotshot
Joined: Jun 2015
Posts: 12,874
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As you could see from the fact that it was taken from another thread, it was originally not my post. Of course this would only apply to a 1997 F-250 HD since the Light Duty model is a completely different body style that was based on the all new F-150 which is probably why the HD/ LD difference was not mentioned.
Mountain Pass
Joined: Jul 2021
Posts: 107
Likes: 28
From: Indianapolis IN
As you could see from the fact that it was taken from another thread, it was originally not my post. Of course this would only apply to a 1997 F-250 HD since the Light Duty model is a completely different body style that was based on the all new F-150 which is probably why the HD/ LD difference was not mentioned.
Thread Starter
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Trailering
Joined: Apr 2023
Posts: 22
Likes: 3
From: Alberta Canada
Yeah I made sure that all the other needles were in the correct space but not the speedo because I thought the sweep it did when plugged back in was it relearning the needle position. Lesson learned I guess
Hotshot
Joined: Jun 2015
Posts: 12,874
Likes: 2,445
Was there a reason you removed the needle(s)? Doesn’t the gauge pop out of the cluster as a unit? I don’t think I ever messed with the gauges on the ‘94 but that is how it works on the ‘87 & ‘89.
Mountain Pass
Joined: Jul 2021
Posts: 107
Likes: 28
From: Indianapolis IN