Squire by Holy Grail Labs

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Coming Soon: Squire by Holy Grail Labs - wiring help for classic car enthusiasts.

Squire is your wiring squire for classic cars. Look at the car. Ask in English. Get guides you can print and a circuit you can trace.

Ask plain-English questions about the electrical system in your classic. Get diagrams you can trace and next steps grounded in real data, with credit to the community when their hard-won fixes apply. Built for a phone at the car as much as a laptop on the bench.

Current Squire Schematic and Guides on published E28 instrument cluster.
Schematic and Guides on the published E28 instrument cluster, under Squire chrome.

“I spent years reading poorly scanned PDFs of the E28 ETMs the hard way, melting fuse boxes the hard way, and learning which forum threads were gold and which were myth,” said Tig Kindel, co-founder of Holy Grail Labs. “Squire is the squire we always wanted: someone who already read the manual, already learned from the community, will walk the harness with you, and will not charge by the hour.”

Tell us what you want

Tell us what you'd like out of Squire. What cars would you use it with? Where would it provide the most value to you?

If you include your email address in your submission, you'll be on the list to get early access!