Is the oil pressure sending unit and the oil pressure switch the same part?

i own a 96 jeep grand cherokee laredo v6. I asked the mechanic to fix the sending unit and the the receipt says they fixed the switch. also the jeep is having the same issues it did when i brought it in. the oil pressure is fine until i drive it for 15 minutes and then any time i stop the oil pressure falls to 0... show more i own a 96 jeep grand cherokee laredo v6. I asked the mechanic to fix the sending unit and the the receipt says they fixed the switch. also the jeep is having the same issues it did when i brought it in. the oil pressure is fine until i drive it for 15 minutes and then any time i stop the oil pressure falls to 0 until i excel..... any help
Update: i have a gauge in the jeep and when i called around to shops they said the part alone, since there is a gauge is $60+. and the mechanics only charged $40 for the part and the labor, it just threw up some red flags that either i got a really good deal or something isnt right
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