This is an easy one but I searched the FSM and I can't seem to find it.
What Ohm rating does a 1991 N/A Fuel gauge sending unit use?

Full-Empty
73 - 10 is Ford
16 - 158 I think this is Ford too.
0 - 30
0 - 90 is GM
240-33 is a Universal.
Did I miss any?
Which one should I be using?

Will there be a problem hooking up a Autometer 2 1/16" Phantom Gauge to it?

I'm swapping all the stock gauges and panel because it's my understanding that the stock ones are not always accurate. I'll be using Fuel, Oil pressure, Voltage & Water Temp. Then i'll go to the 3 3/8" Tach & Speedometer. These will all be clustered in a Custom panel.
Any suggestions are appreciated as always.
While I have your attention, some people have voiced their appreciation of the Equus Gauges. Are they better than Autometer or just cheaper? PRO's and CON's?
Does Equus have the variety that autometer has?
Who has the best prices on the Equus line?
Thank you.

 

Come on guys,
Don't tell me I stumped everyone with this question! Someone must know the answer to this one.
Again, I am changing my Stock 1991 N/A gauge panel and printed circuit board out and building a custom panel using Autometer Phantom gauges.
This is where my problem begins. I must know the Ohm resistance rating that the stock Mazda Fuel gauge SENDING unit (In the GAS TANK)works at for FULL - EMPTY. (EX. Ford= 73 - 10, GM= 0 - 90)
If I put in an un-matched gauge it will burn out or worse and who knows what else could get ruined.
I looked in the FSM but could not find it. Did they leave that out or did I overlook it? If so please tell me the Section and Page # where it can be found.
Thank you.
Sincerely yours,
Robert

 

It's in the Body Elect System

 

It's in the FSM, but you have to look hard for it.

If I remember, it's:

106 ohms = EMPTY
3 ohms = FULL

The only gauge that I found that would work is the Autometer programmable unit. Of course I am using the Ultra Lite series, other series may have different availability.

 

3 full, 33 half, 133 empty...

 

This thread is old but I came across so someone else probably will.

15-31 in the FSM

Empty = 110ohms
Half = 32.5ohms
Full = 3ohms