The are other earlier Part Numbers for this switch. 096-6337, 096-4661, 096-6454, 5I-6966, 7I-8917, & 102-6943.
Its use seems to be restricted to use on the old Mitsubishi E-series excavators. Unfortunately the schematics for those machines are so old that they don't carry the pressure switch specifications like the newer ones do.
Are you trying to get hold of one..? There seem to be plenty on eBay and also at Cat Dealers. Prices in the $80-90 range.