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**hatzie** · 10-19-2018, 08:08 AM

Do you travel and tow enough to make adding the plumbing and electrical to your truck worthwhile? Only you can answer that question.

Adding the plumbing for NL2 dual tanks isn't that difficult.
Even the wiring isn't too tough.

Stock 1977 solenoid valves are obsolete, hard to find, and EXPENSIVE

Since you're essentially starting from scratch there's only one sane way to go... the system that GM used from 1981-1991... the Pollack Motorized Valve.

There's a member here that makes custom NL2 harnesses that include a new 65PSI 81-91 motorized Pollack valve in various configurations with relays for EFI and no relays for carburetors. I've never done business with him but others have. You can likely ask him for the proper connector and wire lengths to reach your chosen switch and location.

10-19-2018, 08:08 AM	#7
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,916	Re: duel tank switch in cab Do you travel and tow enough to make adding the plumbing and electrical to your truck worthwhile? Only you can answer that question. Adding the plumbing for NL2 dual tanks isn't that difficult. Even the wiring isn't too tough. Stock 1977 solenoid valves are obsolete, hard to find, and EXPENSIVE Since you're essentially starting from scratch there's only one sane way to go... the system that GM used from 1981-1991... the Pollack Motorized Valve. There's a member here that makes custom NL2 harnesses that include a new 65PSI 81-91 motorized Pollack valve in various configurations with relays for EFI and no relays for carburetors. I've never done business with him but others have. You can likely ask him for the proper connector and wire lengths to reach your chosen switch and location. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.