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As far as the oil pressure issue, you might also check that the engine ground strap is in good condition. The sender gets its ground from the engine which gets its ground from the chassis.If the engine isn't adequately grounded to the chassis, you will get higher than normal readings. I've experienced this firsthand with a corroded ground strap. The 3.6 has a much larger pressure pump in relation to the scavenge pump than your original 2.2l did, but those readings still seem pretty high provided that's with a fully warm engine. Did the shop that did the conversion remember to reinstall the strap? Or it may have not been there in the first place since you bought it. Check at the nose of the trans. There should be a copper braided strap between the firewall and the nose of the trans. Also, try this. With the engine running run a jumper wire between the engine and a good chassis ground and watch for fluctuation at the guage. If not then its probably mismatched sender and guage like Warren said. BTW. Idle oil pressure is going to be higher on the 3.6 than the 2.2 because of the aforementioned pump differences but not as high as your current readings.
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