1986 Mercruiser 5.7, which wire is oil pressure gauge

[dan2744]

Hi guys, I swapped parts over and do the remember which one is the oil pressure gauge wire. When I switched ignition to HEI, I don't remember which one went to the unit on back of intake

 

[alldodge]

Oil pressure gauge is Light Blue and comes in on pin 8

 

[dan2744]

Yep, it is I found it, gauge works but I'm getting no readings whatsoever. Is the sensor t estable

 

[alldodge]

Turn key ON, then ground the lead going to the sender, the gauge should peg high. If it doesn't then might be the gauge.

To test gauge, make sure you have 12V and a good ground on the gauge. Then ground the gauge sender lead and it should peg high

 

[dan2744]

Gauge pegs when I ground lead going to sender, I'll test gaugauge tomorrow, I hope I don't have 0 oil pressure.