Fox Body Gauge Cluster - Needle Calibration?

[red95gts]

I recently bought a 93 LX that had a white-faced gauge kit installed by the previous owner. The car appears to idle at <500rpm, the speedo is off by 10-15mph, & the Oil pressure is so high you can barely see the needle. The other gauges appear to be right, but considering how out of whack the above are I have little faith that they are very accurate either.

Is there a recalibration procedure for these? I realize they are not terribly accurate to begin with, but I would like them to be as realistic as possible. I suspect that "recalibration" will simply involve putting a known resistance (and therefore current flow) through the gauge and positioning the needle to a known position. Does anyone have any details on this?

Thank you

[dville_gt]

if it's anything like any ford i've owned before, get it warmed up, put all the needles in the middle of NORMAL, and call it a day (except for the speedo/tach of course)

[red95gts]

Since the Fox gauges don't really have true "min" and "max" mark or a needle stop, it would be tough to find true "0" for any of the gauges. What I'm considering is simulating the resistance for HALF the value of the gauge since that would be easy to line the needles up with.

For example - the fuel tank sender is 145 ohms full and 22.5 ohms empty. The midpoint would be ~83 ohms. If I put 83 ohms of resistance across the fuel level wiring and then stick the needle at the midpoint of travel, maybe that will get me half-ass close?

I figure there had to be some method that the Ford (or whoever their supplier was) used to calibrate these things before they were installed. Unfortunately, I haven't found much documented on the internet...

[sspstang]

The best you are going to get with a fox speedo, is the right speedo gear for the gears you have, as far as the tach goes, mine has always been spot on.