Need help, oil temperature gauge giving incorrect readings

[MIBagentQ]

So I've recently installed the oil temperature gauge from CP. However, the thing seems to be WAY off.

Here's what happens:

(power off/engine off) - gauge needle all the way to the left (below 150º), back light is off
(power on/engine off) - gauge needle is all the way to the left (below 150º), back light is on
(power on/engine on for <10 seconds) - gauge needle remains to the left, backlight on
(power on/engine on for 15-20 seconds) - gauge needle rises all the way to the right (above 400º) and remains there
(power off/engine off) - gauge needle returns all the way to the left

(power on/engine off) - gauge needle is at the left, if bike is at ALL warm, after a few seconds it rises to the right and stays there until power is turned off again

I had originally thought that this was due to CP sending me the wrong sender (like a 250º sender instead of a 400º one), but based on a VDO range of 10-180 ohms, the error should NOT be this big

Temp 400º 250º Diff
ºF ohm ohm %
150 180 180 0%
160 173 163 6%
170 166 146 12%
180 160 129 19%
190 153 112 27%
200 146 95 35%
210 139 78 44%
220 132 61 54%
230 126 44 65%
240 119 27 77%
250 112 10 91%
260 105 - 100%
.
.
.
400 10 - 100%

Broken gauge? broken sender? improper wiring? help?

[MIBagentQ]

n/m, I think I figured it out

I had the +/- of the dash lights hooked up to the +/- of the gauge, I guess it was messing up the readings. I cut off the dash lights and it seems to work fine now, will confirm later when i get off work and go for a ride (you can only do so much on a 15 minute coffee break)