How to check guage calibration

[Plumcrazy]

I posted this at the 1970 site but it applies to other years too.  Hopefully someone will find this usefull.

Chrysler made a tool for checking guage calibration. It's basicly a can with two wire leads attached to it with a three position rotary switch that selects one of three resistance values.  The tool is substituted for the sending unit.

The LOW position is 73 ohms
The MIDDLE position is 23 ohms
The HIGH position is 10 ohms

These directions are from the 1970 manual.  This tool was used for decades so other years should be the same.

Temperature guage (a little vague)
The L position should read "C" plus or minus 1/8th inch
The M position should read in the driving range left of the 1/2 position on the dial.
The H position should read "H" on the dial.

Oil guage (also a little vague)
The L position should read "L" plus or minus 1/8th inch.
The M position should read 1/2 on the dial
The H position should read "H" on the dial

Fuel guage (better)
The L position should read empty plus 1/32nd or minus 3/32nds
The M position should read 1/2 on the dial
The H position should read full plus 3/32nds or minus 1/32nd

[Ghoste]

Thanks Plumcrazy.  That is some timely info as I know of a couple of people trying to recalibrate guages right now.

[ChargerRob]

Thanks,   But what do the two leads connect to. 

[Plumcrazy]

Thanks,   But what do the two leads connect to.  

You use the tool as a substitute for the sending unit.  Attach one lead to the wire that connects to the sending unit and ground the other.

[ChargerRob]

Thanks, I'm going to try to build one.