my sender on my '04 HR Imperial with a Cummins ISL went out back in 2011. In my case, the analog gauge went to zero, while my Aladdin read 55psi. It turns out that the sender has two terminals on it. One is analog, and the other is a simple switch. At that time, the simple switch fed the aladdin, which was defaulted to a 55psi reading, sort of an idiot light. My replacement was a VDO 360-023 which has a 0-150 psi range, and my analog gauge is 0-150psi. This sender is available at a number of on-line vendors for less than $50
Dick L. '04 HR Imperial
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