Fuel Lil gauge

[Bootzz]

I'm going to hook up am aftermarket gauge in my truck. Anyone know what ohm resistance I should get for a 1992 f250 7.3?

 

[OLDBULL8]

Is it a fuel guage your asking about? Unless someone knows what resistance the sender has, you'll have to pull the sender out of the tank and measure the resistance.

 

[gatorman21218]

I cant remember the ohm reading but its an oddball one. I couldnt find a gauge with the factory range so I bought an aftermarket sender as well as a new gauge.

 

[Bootzz]

Yes an aftermarket fuel level is what I'm talking about. Ill probably call ford and ask

 

[mf7lakes]

I found a spec at another forum that says: quote

"01-29-2013, 02:36 AM Report Post

I have these numbers saved in a text file, based on info posted on here and at STD over the last 10 years. I haven't verified them independently, but hopefully someone who knows for sure can corroborate or refute these

'87-'97 trucks: 22.5 ohms empty, 145 ohms full"---- unquote

maybe this helps ????

 

[Bootzz]

Hmm ima look at the gauges a Lil more
I don't understand how it works all that great
I don't understand the 2 diff resistances at full or empty

 

[gatorman21218]

basic electrical theory is applied here. ohms law. current equals voltage divided by resistance.

When you apply voltage across a resister, it changes the amperage. So for instance if the range is 0 ohms (full) to 100 ohms (empty), then when the tank is full, it sends full amperage to the gauge therefor making it read full. at half tank (50 ohms = 50%) its giving half the current to the gauge, making the gauge read half. so on so forth....

Thats why different ohm senders do not work with different ohm gauges.