hey guys i just installed an oil pressure gauge and it's reading pass 100psi. it's a brand new autometer. i grounded the gauge near the sender. i also switched the I and S wire and instead of goin pass 100psi it goes pass 0psi. anyone else had this problem? the senders hooked up to a stealthmode firewall kit, on the T. it stays at constant 100psi, doesn't change when i gas, idle, whatever

bad sender? bad gauge?