Problems with gauges on mach 1 -72

[johan_89]

Hello
I have a problem with my original gauges in my mach 1 -72 after I took my instrument cluster out. The temp gauges shows that the engine temp is too high when the engine gets hot. The meter goes to the top even if the engine is not overheated. It's happening after a few minutes when i drive in my neighborhood. I have checked the water circulation and it works. Also my oil pressure and fuel gauges shows to much. Something must have happened when I took my instrument cluster out.

 

[TheRktmn]

Offhand it sounds like the IVR is not grounded correctly or is failing. A bad IVR will make the gauges (Oil, Temp, Fuel) all go to high.

Gauges 101

This applies to the 'accessory' gauges: OIL, FUEL, TEMP. It does not apply to speedometers, tachometers or warning (idiot) lights. I wrote it in plain, simple English so you don't need to be an Electrical Engineer to understand it. It is a basic overview, not a technical bible. Ford kept...

7173mustangs.com

 

[johan_89]

Offhand it sounds like the IVR is not grounded correctly or is failing. A bad IVR will make the gauges (Oil, Temp, Fuel) all go to high.

Gauges 101

This applies to the 'accessory' gauges: OIL, FUEL, TEMP. It does not apply to speedometers, tachometers or warning (idiot) lights. I wrote it in plain, simple English so you don't need to be an Electrical Engineer to understand it. It is a basic overview, not a technical bible. Ford kept...

7173mustangs.com

You were right. The gauges works again after I just rubbed with my fingers on the voltage regulators connection. Some owner before me had put electric tape on it so probably there are some issue with it. I have ordered a new one and also a new circuit from ebay because my instrument lights also works bad. Thanks for helping!

 

[351c1971]

You might consider replacing the bulbs with LEDs while you have the inst. cluster out. I left the bulbs in the turn signal indicators to keep the stock flashers happy.

 

[johan_89]

I have already replaced them but the light is weak and it's only a few that lights at all. I think the problem is the heat from the bulb after many years. I also left the turn signal indicator.

 

[351c1971]

Not sure about the dim LEDs. Is the headlight knob full clockwise? Try rotating the LEDs that do not light 180 degrees. They are polarity sensitive.

 

[Hemikiller]

There's a couple issues with the cluster lighting. The blue diffusers melt from heat and turn brown. The inside of the cluster, which was originally a bright white plastic, yellows with age. You also have dirty contacts on the PC film and the sockets.

A simple fix is to disassemble the cluster, clean and paint the inside of the housings with gloss white spray paint, and replace the melted/burned diffusers with new or good used parts. Replace all the bulbs with new 194s and thing brighten up considerably.

 

[MaddMike]

I have already replaced them but the light is weak and it's only a few that lights at all. I think the problem is the heat from the bulb after many years. I also left the turn signal indicator.

NPD has the new light filters to replace your melted and burned ones.

 

[351c1971]

NPD has the new light filters to replace your melted and burned ones.

You might also check the tension on the socket contact fingers against the printed circuit and bend or replace them as needed.

 

[johan_89]

NPD has the new light filters to replace your melted and burned ones.

What's NPD? Couldn't find when I'm googling.

 

[johan_89]

You might also check the tension on the socket contact fingers against the printed circuit and bend or replace them as needed.

I have replaced all of them so they should be ok.

 

[351c1971]

Try npdlink.com

 

[johan_89]

What's NPD? Couldn't find when I'm googling.

Is it right? https://www.npdlink.com/product/light-filter-dash-housing/208033

 

[johan_89]

NPD has the new light filters to replace your melted and burned ones

How many do I need?

NPD has the new light filters to replace your melted and burned ones.

How many do I need?