To expand on what bulletproof wrote---As far as I remember the multi-function sending unit (which can come as a 3 bar--or 5 bar sender depending on the gauge--Volvo used both) mounts with an angled adaptor fitting between the sender and the block. One electrical connector blade is for the warning lamp--the other for the gauge. I would think that the 3 bar gauge would stay pinned (approx. 45 psi) most of the time while a 5 bar gauge would normally read less than pinned. The base of the sender will have it's spec stamped on it if needed to check that it matches the gauge. -- Dave
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