995 gauge upgrade issues

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DB9952019
Posts: 5
Joined: Thu Mar 14, 2019 6:15 pm
Location: USA

995 gauge upgrade issues

Post by DB9952019 » Mon Apr 01, 2019 7:33 pm

My temp and fuel gauges were broken when tractor was bought at an auction. It's a 995, I ordered new gauges but they differ from original ones. The old gauges had two connection points, one for battery and one for sending unit. The new gauges only have one connection point which I assume is battery. How is the sending unit connected to the new gauge? Any help would be greatly appreciated.

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ollek
Posts: 3795
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 995 gauge upgrade issues

Post by ollek » Mon Apr 01, 2019 8:01 pm

A temp or a fuel gauge with only one connector can not work. The gauge need to have a voltage supply from the battery and one for the sender unite, as your old ones have. Ask the supplier how they assume the connections have to be made. If they can not tell you where the second connector is, return the gauges and get some new and correct ones. I have never heard about any gauges with only one connector. Something has to be wrong here, the gauges or the explanation.

DB9952019
Posts: 5
Joined: Thu Mar 14, 2019 6:15 pm
Location: USA

Re: 995 gauge upgrade issues

Post by DB9952019 » Mon Apr 01, 2019 8:15 pm

Thanks I'll look into that.

DB9952019
Posts: 5
Joined: Thu Mar 14, 2019 6:15 pm
Location: USA

Re: 995 gauge upgrade issues

Post by DB9952019 » Mon Apr 01, 2019 8:26 pm

This what I mean by one connection. It a slip on connection. Maybe sending unit connects to one of the other terminals. Is this incompatible?
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philedge
Posts: 236
Joined: Sun Dec 03, 2006 11:27 am
Location: Chester UK

Re: 995 gauge upgrade issues

Post by philedge » Mon Apr 01, 2019 9:52 pm

Try pulling out the black bit with the flat blade connector on it- I think that could be an illumination light. At a guess the 3 similar studs that look to be insulated would be supply/sender connections.

As for compatibility youd need to get a data sheet for the new gauge to see how it could be hooked up to the tractors sender, if its even possible!
'66 880 Selectamatic rat.

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rid54
Posts: 176
Joined: Mon Oct 13, 2014 8:20 am
Location: Vallentuna, Sweden

Re: 995 gauge upgrade issues

Post by rid54 » Mon Apr 01, 2019 9:53 pm

To me it looks like there is a center spade connector for instrument illumination and two screw-on connections for + and sender. Earth (-) will be through mounting in a metal dashboard or by separate connection to one of the mounting screws.

DB9952019
Posts: 5
Joined: Thu Mar 14, 2019 6:15 pm
Location: USA

Re: 995 gauge upgrade issues

Post by DB9952019 » Mon Apr 01, 2019 10:31 pm

Thanks ill give it a try.

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ollek
Posts: 3795
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 995 gauge upgrade issues

Post by ollek » Tue Apr 02, 2019 9:58 am

Have you checked that the gauges are compatible with the two senders, tank unite and temperature sender? It is important that the resistances in the gauges are compatible to the resistance in the senders. If not, then the gauges will give wrong readings.

DB9952019
Posts: 5
Joined: Thu Mar 14, 2019 6:15 pm
Location: USA

Re: 995 gauge upgrade issues

Post by DB9952019 » Tue Apr 02, 2019 7:55 pm

I'll check into that. Thanks

whesbrook
Posts: 19
Joined: Sat Mar 03, 2018 7:31 pm
Location: Co Down NI

Re: 995 gauge upgrade issues

Post by whesbrook » Tue Apr 30, 2019 7:36 pm

Using your picture of the back of the gauge as reference with the light at the 12 o'clock position.
bolt on the left is the connection to the instrument and should be marked I.
black plastic cylinder in the 12 o' clock position is the light for darkness driving.
bolt to the right is the connection to the battery.
bolt at the 6 o'clock position is the gauge earth.
you will need to get bolt to spade lug connectors from a motor factors to make the gauge connectable to the tractor system.

these gauges are the modern version of the old ones which were earthed via the metal of the dashboard. when cabs came along the dashboards material was changed to plastic which required a separate earth return for the gauges rather than the old method of earthing through the gauge body to the steel of the dashboard.
you will need to provide a separate earth for both of the new gauges.

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