SR5 cluster in 1990 Pickup RN101L

[Matt Sierra]

I've installed a SR5 cluster in my DLX 1990 4wd pickup with 22re and haven't been able to get the oil pressure gauge working. I replaced the oil pressure sender with the correct unit for a gauge (83520-35032) and have followed the factory service manual troubleshooting guide. I can light a 3.4W test bulb when I ground the wire to the sender through the bulb but the gauge moves very slowly and irregularly. I can't light a 3.4 W test bulb when I run a wire from battery + to the sender with the engine running. The gauge has resistance within spec (24.6 ohms).

Questions:
1) Does the gauge normally move quickly (like the battery gauge)? Or slowly (like the fuel gauge)? I was expecting it to respond quickly when I start the truck or connect a test light.
2) Has anyone ever had a bad sender? I get oil leaking out of the sender hole when I remove it, so that isn't clogged, but it seems unlikely that an OEM sender would be bad.
3) Any other testing that anyone recommends aside from what's in the FSM?
4) Should I check out the wiring any further? I assume if I can light a 3.4W test bulb that's not the issue.
Thanks.
-Matt

 

[aztoyman]

Maybe the oil pressure side of things needs to be checked. Can you rig a way to apply pressure to the sensor?

 

[jgranthevagrant]

My gauge responds fairly quickly on start up. then follows rpms for pressure. It is new to the truck since June, because the original hadn't worked for 15 years. Maybe you can find a spare cluster and just swap the gauge?