The 987.1 Boxster and Cayman left the factory without an oil pressure gauge, so there’s nothing on the car’s data bus for the display to read. Fit the 997.1 oil pressure sender and run a single wire to the DME, and oil pressure appears — no coding, no dealer visit. Several owners have already done exactly this.
⚠️ Read this first. This job touches two things worth respecting: the engine’s oil system, and the wiring into your DME. Disconnect the battery before you go anywhere near the DME connector. Work carefully, check everything twice, and accept that you do this entirely at your own risk — see our product disclaimer. If you’re not comfortable with any part of it, find an auto electrician who is, or don’t attempt it.
This is a community modification rather than a 997 Chrono product. We’re documenting it because customers asked, and because it’s genuinely useful — but the car-side work is yours, and the detail below is a starting point rather than a workshop manual.
What you’ll need
| Item | Notes |
|---|---|
| Porsche oil pressure sender | Part 996-606-203-03 — the 997.1 sender |
| Wire | Roughly 1.5 m was enough on a 987.1 Boxster |
| ECU pin | For the DME connector — we can supply this |
| Spade terminal | For the sender end |
Get in touch and we’ll send the wire and the ECU pin out with your order, or on their own if you already have a display.
Fitting the sender
The sender goes in the same location as it does on a 997.1 — and the good news is that on a 987.1 it’s easier to reach from underneath the car than it is on the 911.
Rather than restate work that’s already been documented well, the mechanical side of the swap is covered step by step in the Rennlist write-up “The Bruce’s 15min Guide to Replacing your 997.1 Oil Pressure Sender”. It’s worth reading in full before you start, and checking what’s currently fitted in that port on your own car before you order anything.
Connecting to the DME
On the 987.1 the DME sits on the rear bulkhead, behind the engine opening. The unit and its connectors are the same as the 997’s.
You need pin 35 on Connector IV — the 40-pole connector. The DME has five connectors in total:
| Connector | Poles |
|---|---|
| I | 9-pole |
| II | 24-pole |
| III | 52-pole |
| IV | 40-pole — this is the one you want |
| V | 9-pole |
There’s a clear diagram of the connector layout and pin numbering at pinout.net. Confirm the connector and count the pin against that diagram — on your own car, with the battery disconnected — before you insert anything. Some documentation letters these connectors rather than numbering them, which is a good way to end up in the wrong one.
💡 One wire, that’s it. There’s no module to add and nothing to code. The DME already knows how to read an oil pressure sender — it simply has nothing connected on a 987.1. Give it a signal and it starts broadcasting the value.
Routing the wire
The owner who completed this on a 987.1 Boxster ran the wire from the DME, through the left-hand interior trim, and into the engine bay via the grommet near the centre console. About 1.5 m covered it comfortably.
Keep the run away from anything hot or moving, use the existing looms and channels where you can, and secure it properly — this wire is going to live there.
Checking it works
Reconnect the battery, start the car, and the oil pressure value should appear on the bus straight away. There’s no coding step and no waiting.
To see it on your display, assign a bar to Oil Pressure — any of the three bars on the RPM screen, or either panel on the temperature screen. That’s easiest from the phone app, and every option is listed in the configuration guide. You can show it in bar, PSI, mmHg or kPa.
Nothing showing? Check the wire is properly seated in pin 35 and that you’re in the 40-pole connector, and confirm the spade terminal is making a good connection at the sender end. If you’re still stuck, get in touch.
Oil pressure, on a car that never had it
The 997 Chrono display fits the 987.1 Boxster and Cayman as standard — £279, fitted in 30 minutes, 100% reversible.